Acuity Testing Research Articles

Functional impact of bilateral vestibular loss and the unexplained complaint of oscillopsia.

The vestibulo-ocular reflex (VOR) stabilizes vision during head movements. VOR disorders lead to symptoms such as imbalance, dizziness, and oscillopsia. Despite similar VOR dysfunction, patients display diverse complaints. This study analyses saccades, balance, and spatial orientation in chronic peripheral and central VOR disorders, specifically examining the impact of oscillopsia. Participants involved 15 patients with peripheral bilateral vestibular loss (pBVL), 21 patients with clinically and genetically confirmed Machado-Joseph disease (MJD) who also have bilateral vestibular deficit, and 22 healthy controls. All pBVL and MJD participants were tested at least 9 months after the onset of symptoms and underwent a detailed clinical neuro-otological evaluation at the Dizziness and Eye Movements Clinic of the Meir Medical Center. Among the 15 patients with pBVL and 21 patients with MJD, only 5 patients with pBVL complained of chronic oscillopsia while none of the patients with MJD reported this complaint. Comparison between groups exhibited significant differences in vestibular, eye movements, balance, and spatial orientation. When comparing oscillopsia with no-oscillopsia subjects, significant differences were found in the dynamic visual acuity test, the saccade latency of eye movements, and the triangle completion test. Even though there is a significant VOR gain impairment in MJD with some subjects having less VOR gain than pBVL with reported oscillopsia, no individuals with MJD reported experiencing oscillopsia. This study further supports that subjects experiencing oscillopsia present a real impairment to stabilize the image on the retina, whereas those without oscillopsia may utilize saccade strategies to cope with it and may also rely on visual information for spatial orientation. Finding objective differences will help to understand the causes of the oscillopsia experience and develop coping strategies to overcome it.

Подходы к комбинированной хирургии катаракты и глаукомы в условиях слабости связочного аппарата хрусталика

Purpose. To demonstrate the effectiveness of single-step phacoemulsification of cataracts and antiglaucoma surgery in conditions of weakness of the zonular apparatus. Methods. Patient N., 67 years old, came to S. Fyodorov Eye Microsurgery Federal State Institution (Moscow) with complaints of decreased vision, increased intraocular pressure (IOP), and narrowing of the fields of view of the right eye. The diagnoses: OD Primary open-angle glaucoma 3v, Subluxation of the lens grade 1 OS Primary open-angle glaucoma 1a, OU Complicated cataract, Pseudoexfoliation syndrome. Carried out: autorefractokeratometry, visual acuity testing, computerized perimetry, biomicroscopy, gonioscopy, pneumotonometry, tonometry according to Maklakov, optical biometry. Considering the weakness of the lens zonules, the method of fixation of the intraocular lens (IOL) by optic capture technique was used. Results. Examination and evaluation one week post-operation: Visus 0.6 unc, IOP (pneumotonometry) 11 mmHg without hypotensive therapy; biomicroscopy: a calm eye with a well-expressed filtration bleb at the 12 o’clock position, well-adapted sutures, a transparent cornea of average depth, clear aqueous humor, moderate iris atrophy, round 3 mm pupil with pseudophakia at the pupil’s edge, IOL located in the capsular bag with haptics in the iridociliary groove, stable positioning. Fundus examination shows a pale optic nerve head, excavated with 0.8 cup-to-disc ratio, well-defined borders, narrowed vessels. Macular region appears normal. Conclusion. Combined cataract and glaucoma surgery in a patient with subluxated crystalline lens using the «optic capture» technique and Non-penetrating Glaucoma Surgery allowed preserving the correct and stable position of the IOL with normalization of intraocular pressure without the need for hypotensive therapy during a 1-year follow-up period. Key words: one-stage surgery, primary angle-closure glaucoma complicated by cataract, «optic capture»

Ranibizumab versus laser therapy for the treatment of very low birthweight infants with retinopathy of prematurity (RAINBOW): five-year outcomes of a randomised trial

Concerns remain over the long-term safety of vascular endothelial growth factor (VEGF) inhibitors to treat retinopathy of prematurity (ROP). RAINBOW is an open label randomised trial comparing intravitreal ranibizumab (in 0.2mg and 0.1mg doses) with laser therapy in very low birthweight infants (<1500g) with ROP. Of 201 infants completing RAINBOW, 180 were enrolled in the RAINBOW Extension Study. At 5 years, children underwent ophthalmic, development and health assessments. The primary outcome was visual acuity in the better-seeing eye. The study is registered with ClinicalTrial.gov, NCT02640664. Between 16-6-2016 and 21-4-2022, 156 children (87%) were evaluated at 5 years. Of 32 children with no acuity test result, 25 had a preferential looking test, for 4 children investigators reported low vision for each eye, and in 3 further children no vision measurement was obtained. 124 children completed the acuity assessment, the least square mean (95% CI) letter score in the better seeing eye was similar in the three trial arms-66.8 (62.9-70.7) following ranibizumab 0.2mg, 64.6 (60.6-68.5) following ranibizumab 0.1mg and 62.1 (57.8-66.4) following laser therapy; differences in means: ranibizumab 0.2mg v laser: 4.7 (95% CI:-1.1, 10.5); 0.1mg v laser: 2.5 (-3.4, 8.3); 0.2mg v 0.1mg: 2.2 (-3.3, 7.8). High myopia (worse than-5 dioptres) in at least one eye occurred in 4/52 (8%) children following ranibizumab 0.2mg, 8/55 (15%) following ranibizumab 0.1mg and 11/45 (24%) following laser therapy (0.2mg versus laser: odds ratio: 3.99 (1.16-13.72)). Ocular and systemic secondary outcomes and adverse events were distributed similarly in each trial arm. 5-year outcomes confirm the findings of the original RAINBOW trial and a planned interim analysis at 2 years, including a reduced frequency of high myopia following ranibizumab treatment. No effects of treatment on non-ocular outcomes were detected. Novartis Pharma AG.

Subjective Straylight Index: A Visual Test for Retinal Contrast Assessment as a Function of Veiling Glare.

Spatial aspects of visual performance are usually evaluated through visual acuity charts and contrast sensitivity (CS) tests. CS tests are generated by vanishing the contrast level of the visual charts. However, the quality of retinal images can be affected by both ocular aberrations and scattering effects and none of those factors are incorporated as parameters in visual tests in clinical practice. We propose a new computational methodology to generate visual acuity charts affected by ocular scattering effects. The generation of glare effects on the visual tests is reached by combining an ocular straylight meter methodology with the Commission Internationale de l'Eclairage's (CIE) general disability glare formula. A new function for retinal contrast assessment is proposed, the subjective straylight function (SSF), which provides the maximum tolerance to the perception of straylight in an observed visual acuity test. Once the SSF is obtained, the subjective straylight index (SSI) is defined as the area under the SSF curve. Results report the normal values of the SSI in a population of 30 young healthy subjects (19 ± 1 years old), a peak centered at SSI = 0.46 of a normal distribution was found. SSI was also evaluated as a function of both spatial and temporal aspects of vision. Ocular wavefront measures revealed a statistical correlation of the SSI with defocus and trefoil terms. In addition, the time recovery (TR) after induced total disability glare and the SSI were related; in particular, the higher the RT, the greater the SSI value for high- and mid-contrast levels of the visual test. No relationships were found for low contrast visual targets. To conclude, a new computational method for retinal contrast assessment as a function of ocular straylight was proposed as a complementary subjective test for visual function performance.

Development and Evaluation of a New Self-Administered Near Visual Acuity Chart: Accuracy and Feasibility of Usage.

Background: Visual acuity (VA) assessments are crucial in ophthalmology but traditionally rely on in-clinic evaluations. The emergence of telemedicine has spurred interest in creating dependable self-administered VA tests for use beyond standard clinical environments. This study evaluated the practicality and validity of a self-administered near VA card test against traditional Snellen and Rosenbaum Pocket Vision Screener (RPVS) methods for home monitoring and enhancing clinical workflow. Methods: In a cross-sectional study, a near VA card (Hadassah Self-Visual Acuity Screener (HSVA)) was developed with written and videotaped instructions for self-use. Patients with a minimal best-corrected VA (BCVA) of 1.0 LogMAR in at least one eye were recruited from ophthalmology and optometry clinics. Outcomes included the mean BCVA difference between the self-administered values and those obtained by the examiner, and correlations between BCVA values obtained by the Snellen, RPVS, HSVA, and previous distance BCVA methods according to the patients' electronic medical records. Results: A total of 275 participants (mean age: 42.5 ± 19.4 years; range: 18-89 years; 47% female) were included. Test-retest reliability analysis of the HSVA demonstrated a very good correlation and repeatability (n = 38 patients; Rs = 1.0; p < 0.001). Accuracy analysis revealed the mean LogMAR BCVA values of an additional 237 patients obtained by the Snellen, RPVS, and HSVA methods were similar (p = 0.10). The self-test BCVA results obtained by the HSVA agreed with the masked examiner-tested VA results (n = 67 patients; p = 0.17; Rs = 0.87; ICC = 0.96). Similar results were obtained when stratification by median age (42 years) was performed. Bland-Altman analysis of the HSVA and RPVS methods demonstrated a good agreement. To assess whether the HSVA could predict the VA results in the clinically used charts, multivariate analysis was used and revealed that the HSVA predicted the RPVS results (β = 0.91; p = 0.001; R2 = 0.88), and the self-test HSVA predicted the Snellen VA results within two lines (β = 0.93; p = 0.01; R2 = 0.36). Conclusions: The home-based HSVA assessment exhibited high test-retest reliability, accuracy, and alignment with clinical-standard VA tests. Its efficacy in self-testing mirrored examiner-conducted VA assessments and accurately predicted Snellen VA outcomes, indicating the HSVA's suitability for self-monitoring in chronic ocular conditions or when access to conventional examinations is limited. The utility of self-administered VA tests may extend beyond ophthalmology and optometry, potentially benefiting primary care, emergency medicine, and neurology. Further research is needed to explore and validate the practical applications of remote VA testing.

VISUAL OUTCOME OF TRAUMATIC OPTIC NEUROPATHYAFTER STEROID TREATMENT IN KARIADI HOSPITAL

Introduction: The occurrence of Traumatic Optic Neuropathy (TON) often occurs in the form of head injuries resulting from traffic accidents. TON is an important cause of impaired visual function which may be improved with steroid therapy. Objective: To determine the visual outcome in patients with TON treated with steroids in Kariadi Hospital, Semarang Methods: This research was a retrospective study. Thirty patients (20 males and 10 females) with TON in ophthalmology clinic, Kariadi Hospital Semarang between Januari 2019 and December 2020. Visual acuity, contrast sensitivity and color blindness test were included data from medical record. Steroid therapy were divided into 3 groups. Intraveous steroid injection alone, intravenous steroid followed with oral steroid, and oral steroid alone. The Wilcoxon and paired-t test as comparison test of pre-post therapy in one group and friedman test as comparison test in 3 groups. Results: There were 5 cases that received intravenous steroid, 18 cases received intravenous steroid with oral steroid, and 7 cases received oral steroid. There were difference visual acuity in intravenous steroid with oral steroid (p = 0.001), visual acuity in oral steroid (p = 0.017), and color blindness test in intravenous steroid with oral steroid in pre-post therapy groups (p = 0.036). There were no difference in visual acuity, color blindness test, and contrast sensitivity between pre-post therapy groups when compared between 3 groups (p= 0.692, p =0.368, p=0.273). Conclusion: Patients with TON had better visual outcome after treated with intravenous steroid followed with oral steroid.

Scotopic and Photopic Conventional Visual Acuity and Hyperacuity - Binocular Summation.

The purpose of this study was to determine and compare binocular summation (BiS) of conventional visual acuity (cVA) versus hyperacuity (hVA) for photopic and scotopic luminance conditions as a potential biomarker to assess the outcome of interventions on binocular function. Sixteen young adults (age range [years] = 21-31; 8 women; cVA logMAR < 0.0) participated in this study. The Freiburg Visual Acuity Test (FrACT) was used for VA testing and retested on another day. Both cVA and hVA were determined for dark grey optotypes on light grey background. Participants underwent 40minutes of dark adaptation prior to scotopic VA testing. Binocular and monocular VA testing was performed. The eye with better VA over the 2 days of testing was selected, the BiS was quantified (binocular VA - better monocular VA) and repeated measures ANOVAs were performed. Binocular VA exceeded monocular VA for all luminance conditions, VA-types, and sessions. We report BiS estimates for photopic and scotopic cVA and hVA, (logMAR BiS ± SEM [decimal BiS]): photopic = -0.01 ± 0.01 [1.03] and -0.06 ± 0.03 [1.15]; and scotopic = -0.05 ± 0.01 [1.12] and -0.11 ± 0.04 [1.28], respectively). Improvement for binocular vision estimates ranged from 0.01 to 0.11 logMAR. A repeated-measures ANOVA (RM ANOVA) did not reveal significant effects of LUMINANCE or VA TYPE on BiS, albeit a trend for strongest BiS for scotopic hVA (15% vs. 28%, photopic versus scotopic, respectively) and weakest for photopic cVA (3% vs. 12%, photopic versus scotopic conditions, respectively). Our results indicate that BiS of VA is relevant to scotopic and photopic hVA and cVA. It appears therefore a plausible candidate biomarker to assess the outcome of retinal therapies restoring rod or cone function on binocular vision. Binocular summation of visual acuity might serve as a clinical biomarker to monitor therapy outcome on binocular rod and cone-mediated vision.

Ocular graft host disease after allogeneic stem cell transplant: unique risk factors and outcomes

Objective The aim of this study was to formulate a retrospective study investigating the ocular findings and associated risk factors in long-term survivors after allogenic-hematopoietic stem cell transplantation (HSCT) in Saudi Arabia. Patients and methods This observational study was conducted on patients who underwent HSCT from 1996 to 2016 at King Faisal Specialist Hospital and Research Center in Riyadh, Saudi Arabia. The study included 72 patients who were human leukocyte antigen-matched donors with identical matched sibling donors. Peripheral blood was the source of stem cells in 61 patients. The ophthalmological examination included visual acuity (VA) testing, refraction, tear break-up time, Schirmer’s test, slit-lamp biomicroscopy, and dilated ophthalmoscopy. Chronic ocular graft-versus-host disease (GVHD) inclusion was based on strict selection criteria. The patients identified with mild to moderate ocular GVHD had less than or equal to three corneal staining, 13–32 points ocular surface disease index (OSDI), and Schirmer’s test of 6–15 mm were classified as group 1, while those with severe ocular GVHD defined as having more than four corneal stainings, more than or equal to 33 points OSDI, and less than or equal to 5 mm Schirmer’s test were classified as group 2. Impairment of VA was classified as mild (20/22–20/50), moderate (20/70–&gt;20/200), or severe (≤20/200) impairment. Results Chronic GVHD was diagnosed in 394 patients within the first 5 years after transplantation. Ocular GVHD was detected in 81 (20.56%) patients. They were classified into group 1 (65 patients, 80.25%) with mild to moderate ocular GVHD and group 2 (16 patients, 19.75%) with severe ocular GVHD. All patients had OSDI ranging from more than or equal to 13 to more than or equal to 33. Retinal changes were detected in five patients, optic disc changes in two patients, steroid-induced proliferative diabetic retinopathy in three patients, and old branch retinal vein occlusion in one patient. All patients with identical matched sibling donor showed normal or mild to moderate impaired VA except for two patients. All patients responded to topical eye drops except for nine who required surgical procedures. Normal or mild impaired VA was reported in 59 patients with statistical significance (P=0.0053), while 42 male patients versus 29 females had normal or mild impaired VA with a statistically significant difference (P=0.0179). Conclusion Ocular GVHD is a complex disease in our unique population. Every patient before allogenic HSCT be referred to a cornea specialist to evaluate the baseline parameters for the pre-HSCT diagnosis of dry eye disease.

Real-world application of a smartphone-based visual acuity test (WHOeyes) with automatic distance calibration

BackgroundTo develop and assess the usability of a smartphone-based visual acuity (VA) test with an automatic distance calibration (ADC) function, the iOS version of WHOeyes.MethodsThe WHOeyes was an upgraded version...

The Freiburg Acuity Test in Preschool Children: Testability, Test-Retest Variability, and Comparison With LEA Symbols.

To determine the testability, performance, and test-retest variability (TRV) of visual acuity (VA) assessment using the Freiburg Visual Acuity Test (FrACT) compared to the LEA Symbols Test (LEA) in preschool children. In 134 preschool children aged 3.0 to 6.8years, monocular VA of each eye was measured twice with a four-orientation Landolt C version of the FrACT and once with the LEA. FrACT runs were preceded by a binocular run for explanatory purposes. Test order alternated between subjects. Optotypes were presented on a computer monitor (FrACT) or on cards (LEA) at a distance of 3 m. Overall, 68% completed the FrACT (91/134 children) and 88% completed the LEA (118/134 children). Testability depended on age: FrACT, 19% (<4years) and 87% (≥4years); LEA, 70% (<4years) and 95% (≥4years). Mean ± SD VA difference between tests was 0.11 ± 0.19 logarithm of the minimum angle of resolution [logMAR], with LEA reporting better acuity. The difference depended on age (0.27 ± 0.23 logMAR [<4years], 0.09 ± 0.18 logMAR [≥4years], P<0.001) and on test sequence (higher age dependence of FrACT VAs for LEA first, P<0.001). The 95% limits of agreement for the FrACT TRV were ±0.298 logMAR. The examiner-independent FrACT, using international reference Landolt C optotypes, can be used to assess VA in preschool children aged ≥4years, with reliability comparable to other pediatric VA tests. Use of the automated FrACT for VA assessment in preschool children may benefit objectivity and validity as it is a computerized test and employs the international reference Landolt C optotype.

The Rapid Assessment of Avoidable Blindness survey: Review of the methodology and protocol for the seventh version (RAAB7).

The Rapid Assessment of Avoidable Blindness (RAAB) is a population-based cross-sectional survey methodology used to collect data on the prevalence of vision impairment and its causes and eye care service indicators among the population 50 years and older. RAAB has been used for over 20 years with modifications to the protocol over time reflected in changing version numbers; this paper describes the latest version of the methodology-RAAB7. RAAB7 is a collaborative project between the International Centre for Eye Health and Peek Vision with guidance from a steering group of global eye health stakeholders. We have fully digitised RAAB, allowing for fast, accurate and secure data collection. A bespoke Android mobile application automatically synchronises data to a secure Amazon Web Services virtual private cloud when devices are online so users can monitor data collection in real-time. Vision is screened using Peek Vision's digital visual acuity test for mobile devices and uncorrected, corrected and pinhole visual acuity are collected. An optional module on Disability is available. We have rebuilt the RAAB data repository as the end point of RAAB7's digital data workflow, including a front-end website to access the past 20 years of RAAB surveys worldwide. This website ( https://www.raab.world) hosts open access RAAB data to support the advocacy and research efforts of the global eye health community. Active research sub-projects are finalising three new components in 2024-2025: 1) Near vision screening to address data gaps on near vision impairment and effective refractive error coverage; 2) an optional Health Economics module to assess the affordability of eye care services and productivity losses associated with vision impairment; 3) an optional Health Systems data collection module to support RAAB's primary aim to inform eye health service planning by supporting users to integrate eye care facility data with population data.

Low-contrast visual acuity test is associated with central inflammation and predicts disability development in newly diagnosed multiple sclerosis patients.

The visual system is a prominent site of damage in MS since the earliest phases of the disease. Altered low-contrast visual acuity (LCVA) test has been associated with visual impairment and retinal degeneration, predicting medium- and long-term disability. However, it is unclear whether LCVA may also represent a reliable measure of neuroinflammation and a predictor of disease evolution in the very early stages of MS. We explored in a group of 76 consecutive newly diagnosed relapsing-remitting MS (RR-MS) patients without visual impairment or altered visual evoked potentials, the association between LCVA scores at 2.5% and 1.25% and clinical characteristics, including prospective disability evaluated after 1- and 2 years of follow-up. Associations between LCVA and the CSF levels of IL-10 at diagnosis were also analyzed. A negative correlation was found between LCVA at 2.5% and Expanded Disability Status Scale (EDSS) evaluated at first (Spearman's Rho = -0.349, p = 0.005, n = 62) and second year (Spearman's Rho = -0.418, p < 0.001, n = 62) of follow-up, and negative correlations were found with Multiple Sclerosis Severity Score (MSSS) at first (Spearman's Rho = -0.359, p = 0.004, n = 62) and second year (Spearman's Rho = -0.472, p < 0.001, n = 62). All the data were confirmed by a mixed effect model, considering other clinical variables. A positive correlation was found between the CSF concentrations of IL-10 and LCVA at 2.5% (Spearman's Rho = 0.272, p = 0.020, n = 76), and 1.25% (Spearman's Rho, = 0.276, p = 0.018, n = 76), also evidenced in a linear regression. In MS patients at diagnosis, altered LCVA may be associated with CSF inflammation and represent a useful parameter to identify patients with worse disease course.

Ocular Complication in Vernal Keratoconjunctivitis Patients

Background: Vernal keratoconjunctivitis (VKC) is a chronic ocular allergic condition predominantly affecting the pediatric population. It is characterized by severe inflammation of the conjunctiva and cornea, leading to a spectrum of complications if not adequately treated. The prevalence and impact of VKC vary geographically and demographically, necessitating region-specific investigations to understand its epidemiology, clinical manifestations, and outcomes. Objective: The study aimed to investigate the distribution of VKC types among affected individuals in a specific region, identify the prevalence of associated ocular complications, and evaluate the demographic characteristics of the patient population. Methods: This descriptive study was conducted over an 8-month period, assessing 200 patients diagnosed with VKC at the outpatient department of ophthalmology in HMC Peshawar. Patients were included based on recurrent signs and symptoms of VKC, excluding those with other ocular conditions. A comprehensive ophthalmic examination was performed, encompassing uncorrected and corrected visual acuity tests, anterior slit lamp examination, fundus examination with a 78D lens, intraocular pressure measurement using a Goldman applanation tonometer, and keratometry. Corneal topography was conducted for suspected cases. Data were analyzed using SPSS version 25.0, focusing on the distribution of VKC types, gender prevalence, and complication rates. Results: The study revealed a significant male predominance (73%) among VKC patients, with the limbal type being the most common form of the condition (45%). Complications were observed in 21% of the patients, with irregular astigmatism (35.7%) and keratoconus (26.2%) being the most prevalent. The gender distribution and types of VKC highlighted the need for targeted clinical attention, especially considering the potential for serious complications such as corneal scarring, cataract, and glaucoma. Conclusion: VKC remains a significant pediatric ocular health concern, with a marked male predominance and a high incidence of complications that can impact the quality of life. Early diagnosis, effective management, and regular follow-up are crucial to mitigate the risk of long-term visual impairment. The findings underscore the importance of awareness and education among healthcare providers and caregivers regarding the potential severity of VKC and the necessity for timely intervention.

Clinical usefulness of the baby vision test in young children and its correlation with the Snellen chart.

To investigate the efficacy of a new visual acuity (VA) screening method, the baby vision test for young children. A total 105 eyes of 65 children aged 2-8y were included in the study. Acuity testing was conducted using a standardized recognition acuity chart (Snellen visual chart: at 3 m) and the baby vision model assessment. The baby vision device includes a screen, a near infrared camera and a computer. Children were seated at a measured distance of 33-40 cm from a display for testing. VA was estimated according to the highest resolution the children could follow. Decimal VA data were converted to logarithm of the minimum angle of resolution (logMAR) for statistical analysis. The VA results for each child were recorded and analyzed for consistency. The mean VA measured using the Snellen visual chart was 0.62±0.32, and that assessed using the baby vision test was 0.66±0.27. The 95% limit of agreement was -0.609 to 0.695, with 95.2% (100/105) plots within the 95% limits of agreement. VA values of the baby vision test were significantly correlated with those of the Snellen chart (R=0.274, P=0.005). The baby vision test can be used as a relatively reliable method for estimating VA in young children. This new acuity assessment might be a valid predictor of optotype-measured acuity later in preverbal children.

Interaction between visual impairment and subjective cognitive complaints on physical activity impairment in U.S. older adults: NHANES 2005–2008

Background/aimTo investigate the independent relationships of visual impairment (VI) and Subjective cognitive complaints (SCC) with physical function impairment (PFI) and the interaction effect between VI and SCC on PFI in American older adults.MethodsThe data of this cross-sectional study was obtained from the 2005–2008 National Health and Examination Survey (NHANES) conducted in the United States. The VI criterion included both subjective self-reported eyesight conditions and objective visual acuity test results. The self-reported questionnaires were utilized to determine PFI and SCC. According to the survey design of NHANS, original data were weighted to produce nationally representative estimates. Both the unweighted original data and weighted estimates underwent analysis. Crude and adjusted logistic models were employed to assess the pairwise associations among VI, SCC, and PFI. To assess the interactive effect, measures such as the relative excess risk due to interaction (RERI), attributable proportion due to interaction (AP), and synergy index (S) were calculated.ResultsA total of 2,710 subjects (weighted n = 38,966,687) aged 60 years or older were included. Compared with subjects without subjective visual impairment (SVI), those with SVI had a significant positive association with PFI [weighted OR (95%CI): 3.11 (2.25, 4.31)]. After multi-variable adjusting, the relationship remained significant [weighted OR (95%CI): 1.90 (1.32, 2.72)]. Similarly, those with objective visual impairment (OVI) were positively associated with the risk of PFI in the crude model [weighted OR (95%CI): 2.35 (1.53, 3.61)] and adjusted model [weighted OR (95%CI): 1.84 (1.07, 3.17)]. Moreover, we found the association of SCC with an increased risk of FPI [crude weighted OR (95%CI): 5.02 (3.40, 7.40); adjusted weighted OR (95%CI): 3.29 (2.01, 5.38)]. Ultimately, the additive interaction showed there was a significant positive interaction term between SVI and SCC on PFI, while OVI and SCC did not.ConclusionBoth VI and SCC were significantly associated with PFI in elder adults. Besides, there was a significant synergistic interaction between SVI and SCC on PFI, which indicated the improvement of SVI and SCC may be beneficial for the prevention of PFI. For the elderly, especially those with multiple disabilities, comprehensive and targeted approaches are imperative to foster their overall well-being and health.

Vision screening using the Acuidrive device

ABSTRACT Clinical relevance Understanding devices used for vision screening, including their potential utilisation and validity, will facilitate proper utilisation of this technology. Background The Acuidrive is a self-illuminated, hand-held, visual acuity screening device intended for use in policing, with visual acuity assessed roadside to identify drivers who may not meet vision standards for driving. The target is presented binocularly at 24 cm, and +4.00 D lenses eliminate the accommodation requirement. This study investigates its validity and applicability relative to the Early Treatment of Diabetic Retinopathy Study (ETDRS) chart. Methods There were 36 participants, half younger adults aged 18–30 years and half older adults aged 50–70 years. The subjects underwent binocular visual acuity testing using the Acuidrive device and an ETDRS chart displayed on a monitor. Eyes were corrected for distance using lenses in a trial frame, and additional trial lenses provided four blur levels: zero, +0.50 DS, +1.00 DS and +1.50 DS. Luminances for the devices were similar at approximately 100 cd/m2. ETDRS chart measurements were conducted both with room lighting on and off. Results The Acuidrive device underestimated the ETDRS visual acuity across all blur levels, with mean differences of 0.24 ± 0.07 logMAR and 0.18 ± 0.10 logMAR for room lights on and off, respectively. To predict ETDRS visual acuity of poorer than 0.34 logMAR (6/12=), a screening level of 0.50 logMAR (6/19) with the Acuidrive device provided high sensitivity and specificity (86% and 79% with lights-on, and 85% and 78% with lights-off). Visual acuity was better for the older group than the younger group by approximately 0.10 logMAR. Conclusion There was an offset of 0.2 logMAR (two lines) between visual acuity measures for the Acuidrive device and an ETDRS chart. The Acuidrive device has the potential to be a viable screening tool with refinement to its construction.

THE EFFECT OF SERUM 25-HYDROXY VITAMIN D ON VISUAL FIELDS IN MODERATE - HIGH MYOPIA

Introduction &amp; ObjectivesMyopia is a visual impairment problem that constantly increases, causing global health problemsand economic burdens. Previous studies have concluded that vitamin D deficiency is associated withdecreased visual acuity and visual function. To determine the relationship between serum 25(OH)Dlevels and visual fields in moderate to high myopia&#x0D; MethodsThis study was an observational analytic study with a cross-sectional design. Visual function testsperformed were visual acuity test, Humphrey visual field analyzer, and ELISA test for serum25(OH)D.&#x0D; ResultsThe study consisted of 50 subjects with moderate to high myopia with 39 subjects was females (60%)and mean age of 26.62±3.70 years. The distribution of moderate myopia and high myopia was 30%and 20% with a mean spherical equivalent of -5.11±1.54 D. Twenty four subjects (48%) had serum25(OH)D deficiency, 1 subject (2%) had insufficiency of serum 25(OH)D with an average level of44.56±41.45 ng/ml. Fischer's Exact analysis on the right eye revealed 7 subjects (29.2%) had serum25(OH)D deficiency and insufficiency with visual field defect (p=0.001). On the left eye, 6 subjects(25%) had serum 25(OH)D deficiency and insufficiency with visual field defect (p=0.132).&#x0D; ConclusionThere was statistically significant relationship between serum 25(OH)D levels and visual field inmoderate to high myopia in one eye.

Effects of brightness variations on a smartphone-based version of Radner reading charts.

The purpose of this study was to evaluate the equivalence of smartphone-based measurements of near visual acuity under different screen brightness conditions with a standard near visual acuity test. On a sample of 85 participants, we have evaluated near visual acuity with a smartphone-based version of the Radner reading chart at three distinct screen brightness levels. Results have been compared with those obtained with classical Radner paper charts. We have found that, when a sufficient screen brightness is employed, the smartphone-based version of the Radner reading chart produces results that are in line with the paper Radner charts while low brightness levels lead to a significant underestimation of reading acuities. This result was consistent across different refractive conditions. In conclusion, we have shown that handheld devices, such as smartphones, can be potentially exploited for remote measurements of near visual acuity provided a correct control of brightness screen is employed.

Correlation between color vision, visual acuity, contrast sensitivity and photostress recovery in the visually impaired: a cross-sectional study

Background: To investigate the correlation of colour vision, visual acuity, contrast sensitivity, and photostress recovery time test scores in visually impaired patients. Materials and methods: A total of 133 subjects were enroled and 133 eyes were examined. The pathological group consisted of 76 (57.1%) males with an average age of 68.0 (SD=13.2) and 57 (42.9%) females, with an average age of 68.1 (SD=15.2), Mann–Whitney U test was used to evaluate the differences in K-colour tests, HRR, visual acuity, Contrast Sensitivity test and photostress recovery time test between two different groups of severity. Results: Correlations were found among colour vision tests, visual acuity, contrast sensitivity, and photostress recovery time scores in eyes with age-related macular degeneration, with diabetic retinopathy, with optic nerve diseases, and various other retinal diseases (P&lt;0.05). In patients with moderate-visual impairments. Conclusions: The colour vision test scores correlate with the scores of visual acuity, contrast sensitivity, and photostess recovery time test. It may be a useful clinical surrogate for functional vision.

Alteration Ocular Motility in Retinitis Pigmentosa: Case-Control Study.

To evaluate ocular motility (OM) disorders and strabismus in a sample of patients with retinitis pigmentosa (RP) and a control sample. In this cross-sectional retrospective analysis, we studied a sample of RP patients with a mean age of 48.74 years and an average visual acuity of 7/10 based on Snellen optotype and a sample of control patients with similar mean age (49 years [men], 47 years [women]) and sex and an average visual acuity of 9.9/10, with the aim of assessing correlations between alteration of OM and strabismus in RP patients based on age, high refractive defect, or severely impaired binocular vision. The examination followed a protocol of testing for anamnesis and best-corrected visual acuity, as well as a complete eye examination, corneal reflex, cover test, OM, Hess screen, and Lang test. At the first orthoptic evaluation, 45.16% of patients showed strabismus, 41.93% exotropia (25% of cases intermittent), 3.22% esotropia, and 6.45% vertical deviation. Later evaluation showed strabismus in 25.80% of patients, exotropia in 19.35% (9.67% intermittent), esotropia in 3.22%, and vertical deviation in 3.22%. Assessment of eye motility study showed 51.6% overaction of the inferior oblique and hypofunction of the superior rectus, and 18% overaction of the lateral rectus and hypofunction of the medial rectus. According to our results, alterations in OM and strabismus in RP patients are not correlated with age or high refractive defect. Therefore, motility disorders and strabismus are attributed to a genetic factor to which men are more susceptible. The incidence of OM disorder was 77.42%, and strabismus was present in 45.16% of patients.