Anterior Lens Research Articles

Evaluation of repeatability and agreement of two optical biometers for intraocular lens power calculation.

The repeatability of two biometers (Lenstar-LS900 and Eyestar-900) to measure ocular parameters and intraocular lens (IOL) power calculation, and their agreement were evaluated. 134 eyes of 134 participants were measured thrice with each biometer. Axial length (AL), anterior chamber depth (ACD), lens thickness (LT) and keratometry (K) were evaluated. The IOL power was calculated using different formulas. The repeatability limit (RLimit), the mean differences (MD) and the limits of agreement (LoA) were calculated. The RLimits for all parameters were higher with Lenstar compared to Eyestar. RLimits were lower than 0.50 D except for Barrett Universal II (0.54 D) and Haigis (0.51 D) formulas with the Lenstar. Mean differences were lower than 0.01mm for AL, ACD and LT, and lower than 0.03 D for K. MD ranged from 0 to 0.02 D for all formulas except for Barrett and Hill. When dividing the sample into subgroups (short, normal and long eyes), the MDs were similar for the IOL power and were lower than 0.03 D, except for the Barrett and Hill formulas. Both biometers provide repeatable biometry and IOL power calculations. The LoA interval for the IOL power calculation was between 0.75 and 1.50D, which was similar among the subgroups.

Clinical characteristics and diagnostic test for spherophakia: A retrospective analysis

BackgroundThis study aimed to analyze ocular characteristics in patients diagnosed with spherophakia, establish effective diagnostic criteria, and aid clinicians in prompt identification and management. MethodsA retrospective case series identified spherophakia cases through medical records and literature searches. The case group included spherophakia patients, and the control group comprised individuals with similar eye conditions. Intraocular lens calculations used the SRK-T formula, and statistical analyses were performed using SPSS. Diagnostic efficacy was assessed through receiver operating characteristic (ROC) curve analysis. ResultsThe study included 12 cases (23 eyes) from medical records and 86 patients (142 eyes) from literature sources. Characteristics of spherophakia included bilateral involvement, younger age, shallow anterior chamber depth, lens dislocation, and secondary glaucoma. A diagnostic criterion based on lens power demonstrated high sensitivity (94.3 %) and specificity (91.9 %). ROC analysis yielded area under the ROC curve (AUROC) values of 0.974 for lens power, outperforming refractive error (0.119), corneal curvature (0.465) and axial length (0.496). The lens power cutoff for diagnosing spherophakia was 31.25D. ConclusionThe study offers crucial insights into spherophakia's clinical characteristics and presents a practical diagnostic criterion using lens power, enhancing early detection and management. Further research is needed to validate and refine these findings, establishing standardized diagnostic criteria for spherophakia.

Magnetic Resonance Imaging of Temporomandibular Joint and Aortic Root Score in Fibrillinopathies.

Background and Objectives: Fibrillinopathies have different phenotypic expression: Marfan-like skeleton features, MLSF; mitral valve prolapse syndrome, MVPS; MASS phenotype, M = mitral valve prolapse, MVP, A = aortic root dilation, S = skeletal features, and the second S = (cutaneous) striae; Marfan Syndrome, MS. The study had the following main objectives: the correlation between disc displacement, DD (a major sign for temporomandibular joint dysfunction, TMDs) on magnetic resonance imaging, MRI, and aortic Z score (a major sign for aortic root dilation) on echocardiography; the predictive value of DD towards aortic Z score. DD had 2 types of severity: DD with reduction (the mild type, DDwR), and DD without reduction (the severe type, DDwoR). Materials and Methods: The type of fibrillinopathy was precised by clinical exam (systemic score), ophthalmic exam (for ectopia lentis), and echocardiography (aortic Z score, MVP). Medical treatment consisted of betablockers, BB (for patients with tachycardia), or angiotensin II receptor blockers, ARB. Surgical treatment was addressed to aortic root aneurysm, and severe mitral regurgitation, MR. DD benefited from dental conservatory treatment or surgical restoration. Results: DD-Z score had a powerful correlation in MASS (Rho = 0.787, p < 0.01), and in MS patients (Rho = 0.819, p < 0.01). For the entire sample, both DDwR-Z score and DDwoR-Z score had a moderate correlation (Rho = 0.469, and respectively 0.669). Furthermore, DD was an important predictor for Z score. DDwoR had a double power of prediction for the Z score compared with DDwR (B coefficient = 1.661 for DDwR and 3.281 for DDwoR). Conclusions: TMDs had a powerful correlation with aortic root dilation in MASS and MS patients from the sample. Likewise, TMDs was a major predictor for aortic root dilation, in the entire sample. In clinical practice, we can utilize an extracardiac finding, TMDs, obtained by a non-invasive technique, MRI, for cardiac severity stratification of fibrillinopathies.

Alterations in anterior lens capsule structure and LTBP-2 expression in primary angle-closure glaucoma

ObjectiveThis study investigated the role of latent-transforming growth factor β-binding protein 2 (LTBP-2) in primary angle-closure glaucoma (PACG) by analysing its expression and the ultrastructure of the anterior lens capsule...

“Don’t miss the globe” – Study of diagnostic accuracy of computed tomography in detecting open globe injury

Abstract: PURPOSE: The purpose is to determine the computed tomography (CT) characteristics of open globe injury and establish the relative accuracy and reliability of various features on CT. Second, to assess the significance of a difference in the anterior chamber depths (ACDs) on CT in cases of open globe injury. METHODS: The diagnostic database of our radiology department was retrospectively reviewed to obtain details of patients with a history of blunt or penetrating injury to the orbit between September 2018 and March 2021. A total of 190 patients (144 males and 46 females) were included. A radiologist analyzed the CT scans without prior knowledge of ophthalmologic findings or surgical outcomes. Operative and ophthalmic examination findings were considered the gold standard for comparison. RESULTS: Out of 190 injured globes, the final clinical diagnosis confirmed 54 (28.4%) open globe injuries and 136 (71.5%) closed globe injuries. Between the two groups, intraocular hemorrhage, lens dislocation, lens injury or absence, intraocular foreign body, intraocular air, wall/contour defect, and ACD change were considered statistically significant (P &lt; 0.05). The average sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of CT in diagnosing open globe injury were 71.3%, 98.5%, 83.6%, 95.75%, and 94.9%, respectively. CONCLUSION: Globe contour deformity or defect, intraocular hemorrhage, and a change in ACD were the three most predictive signs of open globe injury. CT is of valuable help in a multi-trauma setting and in an uncooperative patient for ophthalmological examination to draw attention to globe injury. However, CT examination alone is insufficient in detecting all cases of open globe injury. There is a need for a more collaborative approach among emergency physicians, ophthalmologists, and radiologists.

Ultrasound biomicroscopy qualitative and quantitative signs of phacoantigenic uveitis.

To describe the ultrasound biomicroscopy (UBM) diagnostic features in patients suspected of experiencing chronic inflammation due to phacoantigenic uveitis SUBJECTS/METHODS: This single-center study enrolled patients referred to the Uveitis Department of Cleveland Clinic Abu Dhabi for chronic anterior uveitis and traumatic cataract. Patients' demographics, causes and dates of the inciting traumatic event, and ophthalmic findings were recorded. 20-MHz UBM assessment of the status of the anterior capsule and the crystalline lens was performed. Then, cataract surgery was performed using a single technique. Comparison of the anterior capsule and lens status by clinical, UBM, and intraoperative evaluation. Forty eyes with phacoantigenic uveitis were considered. The slit-lamp examination could identify interruption of the anterior capsule in 20% of the eyes and liquefied sinking lens material in 10%. An intra-operative defect in the anterior capsule was documented in 87.5% of eyes. UBM imaging showed anterior capsule irregularity in 63.3% of eyes and confirmed the presence of anterior capsule defects in 47.5% and lens matter herniating into the anterior chamber in 15%. Hypoechogenic lacunae within the cataractous lens were detected in 12.5% of eyes. For UBM, sensitivity and specificity values were 82.86% (95% CI: 66.35-93.44) and 100% (95% CI: 47.82-100), respectively. Positive and negative predictive values for UBM were 100% (95% CI: 88.06-100) and 45.45% (95% CI: 28.69-63.32), respectively. The overall diagnostic accuracy of UBM was 85% [95% CI: 70.16-94.29]. Ultrasound Biomicroscopy (UBM) is essential for assessing suspected anterior capsule ruptures in phacoantigenic uveitis cases.

Mutations in ADAMTSL4 cause a unique form of autosomal-recessive congenital ectopia lentis

Several unique mutations of ADAMTSL4 leading to congenital ectopia lentis (CEL) have been previously reported by our team. The purpose of this study is to find out the possible mechanism of a recurrent novel intronic variant in ADAMTSL4 led to CEL. Twelve novel ADAMTSL4 mutations with a unique form congenital ectopic lentis were detected previously by panel-based NGS. Genetic analysis verified a novel heterozygous ADAMTSL4 variation c.2177+4A > G on Intron 11 in two unrelated patients with iris and lens abnormalities. MINI-Gene assay showed two splicing modes of mRNA that process two different bands A and B, and mutant-type shows replacement with the splicing mode of Exon 11 skipping. Construction of wild-type and mutant ADAMTSL4 vector showed the appearance of premature termination codons (PTC). In vitro expression detection showed significant down-regulated expression level of ADAMTSL4 mRNAs and proteins in cells transfected with mutant vectors compared with in wild-type group. On the contrary, translation inhibitor CHX and small interfering RNA of UPF1 (si-UPF1) significantly increased mRNA or protein expression of ADAMTSL4 in cells transfected with the mutant vectors. 12 novel mutations in ADAMTSL4 gene have been previously reported by our team in 6 CEL patients with a unique series of ocular abnormalities. The recurrent novel ADAMTSL4 mutation c.2177+4A > G triggering the splicing mode of Exon 11 skipping and NMD would cause the decrease of ADAMTSL4 proteins that participate in biosynthesis and assembly of microfibers, which might lead to CEL, and suggest that sequencing of certain intronic splicing varition might be a vital tool for genetic counseling and prenatal diagnoses.

Intraocular Pressure-Lowering Effect of Intraocular Lens Refixation in Patients with Elevated Intraocular Pressure Due to Intraocular Lens Subluxation.

Background and Objectives: To evaluate the surgical outcomes of intraocular lens (IOL) refixation with vitrectomy in patients with elevated intraocular pressure (IOP) due to IOL subluxation. Materials and Methods: Patients with elevated IOP due to IOL subluxation who had undergone IOL refixation with vitrectomy between 1 June 2013 and 31 December 2023 were retrospectively evaluated. The primary outcome measure was surgical success or failure. Surgical success was defined as a reduction of ≥20% in the preoperative IOP or IOP ≤ 21 mmHg (criterion A), IOP ≤ 18 mmHg (criterion B), or IOP ≤ 15 mmHg (criterion C). Reoperation, loss of light perception, and hypotony were considered as surgical failure. The IOP, number of glaucoma medications used, postoperative complications, and visual acuity were evaluated as the secondary outcomes. The surgical outcomes were compared between the glaucoma and ocular hypertension (OH) groups. Results: At 12 months postoperatively, the probability of success was 72.5%, 54.1%, and 28.4% using criterion A, B, and C, respectively, and the mean IOP and mean number of glaucoma medications used had decreased significantly (p < 0.01 and p = 0.03, respectively). Furthermore, the cumulative success rate was significantly higher in the OH group than in the glaucoma (100% vs. 47.4%; p < 0.01) when using criterion A. Additional glaucoma surgery was required only in the glaucoma group. Conclusions: IOL refixation surgery significantly decreases the IOP and number of glaucoma medications required in patients with elevated IOP due to IOL subluxation. Thus, IOL refixation surgery alone without glaucoma surgery might be effective as the primary procedure in such patients.

Effect of lighting conditions on implantable collamer lens vault: Influence of anterior chamber and lens parameters

PurposeTo investigate the change in the vault of the implantable collamer lens (ICL) under dark-to-light conditions and its association with anterior chamber and lens parameters in patients undergoing ICL surgery. MethodsIn 76 eyes from 40 patients, preoperative anterior chamber volume (ACV), pupil diameter (PD), anterior chamber angle, central corneal thickness (CCT), white-to-white (WTW), lens thickness (LT), axial length (AL), spherical equivalent (SE) and patient's age were collected. Postoperative vault, PD and LT were measured under dark and light conditions using anterior segment optical coherence tomography (CASIA2; TOMEY, Japan), and changes and lens displacement under dark-to-light conditions were calculated. Mixed-effects models were used to analyze the correlation between the vault change and the anterior chamber and lens parameters of all subjects and the high-vault subgroup. ResultsThe vault under light condition (648.36 ± 304.47 μm) was significantly smaller compared to the vault under dark condition (708.89 ± 316.15 μm). In all patients, vault change increased with the increase of age, lens displacement and PD change; and increased with the decrease of ACV, LT change and baseline vault (under dark condition). In the high-vault subgroup, vault change increased with the increase of CCT, lens displacement and PD change; and increased with the decrease of ACV. ConclusionsICL vault changes significantly from dark to light, influenced by age, ACV, PD change, LT change, lens displacement, and baseline vault. A higher baseline vault is correlated with a larger LT change, affecting the levels of accommodation under dark-to-light transition.

A Case of Fulminant Serratia marcescens Panophthalmitis After Penetrating Keratoplasty

Purpose: To report the first case of fulminant Serratia marcescens panophthalmitis after penetrating keratoplasty (PK). Methods: This is a report of a patient who developed fulminant panophthalmitis shortly after undergoing PK with anterior chamber intraocular lens placement. Slit-lamp examination, B-scan ultrasound (B scan), and orbital computed tomography of the left eye (OS) were performed to further evaluate the patient. Tissue culture and histopathologic examination of the corneal specimen were completed to confirm the diagnosis. Results: A 78-year-old pseudophakic woman presented with 2 days of increasing pain, swelling, and purulent discharge after uneventful PK and secondary anterior chamber intraocular lens placement OS. Examination was notable for light perception without projection, elevated intraocular pressure of 48 mmHg, and a perforated corneal ulcer. B scan demonstrated diffuse vitreous opacities and membranes. Orbital computed tomography demonstrated proptosis and high-attenuation material within the left globe. Canthotomy, vitreous sampling, and antibiotic injections were performed. Corneal tissue cultures grew S. marcescens. Therapeutic PK was performed, but after rapid decompensation, the eye was eviscerated. Conclusions: This is the only reported case of fulminant S. marcescens panophthalmitis after PK. S. marcescens panophthalmitis is an aggressive and rapidly progressive infection with poor visual outcomes despite appropriate intravitreal and systemic antibiotic therapy.

Finite Element Analysis of Mechanical Ocular Sequelae from Badminton Shuttlecock Projectile Impact

PurposeWith the growing popularity of badminton worldwide, the incidence of badminton-related ocular injuries is expected to rise. The high velocity of shuttlecocks renders ocular traumas particularly devastating, especially with the possibility of permanent vision loss. This study investigated the mechanism behind ocular complications though simulation analyses of mechanical stresses and pressures upon shuttlecock impact. DesignComputational simulation study ParticipantsNone MethodsA 3-dimensional human eye model was reconstructed based on the physiological and biomechanical properties of various ocular tissues. FEA simulations involved a frontal collision with a shuttlecock projectile at 128.7 km/h (80 mph). Intraocular pressure changes and tissue stress were mapped and quantified in the following ocular structures: the limbus, ciliary body, zonular fibers, ora serrata, retina, and optic nerve head. Main Outcome MeasuresIntraocular pressure and tissue stress ResultsUpon shuttlecock impact, compressive force was transferred to the anterior pole of the cornea, propagating posteriorly to the optic nerve head. Deflection of forces anteriorly contributed to refractory oscillations of compressive and tensile stress of ocular tissue. Initial impact led to a momentary (< 1 ms) spike in intraocular pressure 5.66 MPa (42.5 x 103 mmHg) that radially distributed for a very brief instance (< 1 ms) of pressure at the trabecular meshwork of the iridocorneal angle of 1.25 MPa (9.4 x 103 mmHg). The lens had a maximal posterior displacement of 1.5 mm with peak zonular fiber tensile strain of 52%. The limbus, ciliary body, and ora serrata had a peak tensile stress of 5.16 MPa, 1.90 MPa, and 0.62 MPa, respectively. Compressive force from the sclera concentrated at the optic nerve head for a peak stress of 5.97 MPa while peak pressure from vitreous humor was 7.99 MPa. ConclusionShuttlecock impact led to a very brief, substantial rise in pressure and stress significant for tissue damage and subsequent complications, such as secondary glaucoma, angle recession, lens subluxation, hyphema, or retinal dialysis. Our findings offer valuable mechanistic insights into how ocular structures are affected by shuttlecock projectile impact to inform clinical assessments and treatment strategies, while highlighting the importance of protective eyewear in racket sports.

A Novel Heterozygous Intronic FBN1 Variant Contributes to Aberrant RNA Splicing in Marfan Syndrome.

Marfan syndrome (MFS) is a complex genetic systemic connective tissue disorder. It is well known that genetic factors play a critical role in the progression of MFS, with nearly all cases attributed to variants in the FBN1 gene. We investigated a Chinese family with MFS spanning two generations. Whole exome sequencing, in silico analysis, minigene constructs, transfection, RT-PCR, and protein secondary structure analysis were used to analyze the genotype of the proband and his father. The main clinical manifestations of the proband and his father were subluxation of the left lens and high myopia with pectus deformity. Whole exome sequencing identified a novel single nucleotide variant (SNV) in the FBN1 gene at a non-canonical splice site, c.443-3C>G. This variant resulted in two abnormal mRNA transcripts, leading to a frameshift and an in-frame insertion. Further invitro experiments indicated that the c.443-3C>G variant in FBN1 was pathogenic and functionally harmful. This research identified a novel intronic pathogenic FBN1: c.443-3C>G gene variant, which led to two different aberrant splicing effects. Further functional analysis expands the variant spectrum and provides a strong indication and sufficient basis for preimplantation genetic testing for monogenic disease (PGT-M).

Description of a new method to calculate the equator of the crystalline lens using AS-OCT images: Accuracy in non-dilated measurements.

To establish a methodology for objectively estimating the Lens Equatorial Plane (LEP) from clinical images, comparing LEP with dilated versus non-dilated pupils. A cohort of 91 eyes from 60 patients undergoing preoperative assessments for cataract surgery was evaluated. Anterior Segment Optical Coherence Tomography (AS-OCT) images were analysed under conditions of pharmacologically induced pupil dilation versus a non-dilated pupil. Geometrical parameters, including LEP, intersection diameter (ID), lens thickness (LT), anterior and posterior lens thickness were automatically calculated by applying standard image processing techniques to clinical AS-OCT images. Significant differences in lens parameters, including LEP, were observed between dilated and non-dilated conditions (all p < 0.001). A strong linear correlation was found across all geometrical variables under both conditions (r[LEP] = 0.64, r[ID] = 0.78, r[LT] = 0.99, all p < 0.001); enabling reliable correction of these differences. The study introduces an objective methodology for LEP calculation, emphasising the need to consider the eye's physiological state during preoperative measurements. Incorporating LEP into future intraocular lens (IOL) power calculation formulas and replacing the habitual effective lens position may potentially improve the accuracy of IOL power estimation and thus postoperative visual outcomes.

Phenotypic Heterogeneity of Patients With Marfan Syndrome in Puerto Rico: A Case Series.

Previous studies have reported on the cardiovascular, ocular, and musculoskeletal findings in patients with Marfan syndrome (MFS). This study aims to report the ocular and genotypic findings in patients with the syndrome in Puerto Rico. A chart review of a cohort of patients with the syndrome from Puerto Rico was done. Patients were examined by at least one of the authors (NJI). Fibrillin-1 (FBN1) full gene sequencing was done to all patients (Laboratory for Molecular Medicine, Center for Genetics and Genomics, Cambridge, MA). This study was approved by the Institutional Review Board of the Universidad Central del Caribe (approval number: 2024-07). Results: Six patients aged 28-79 years were examined. There were seven female and three male patients. The average visual acuity was 0.49 and 0.52 in the right eye (OD) and left eye (OS), respectively. The average refraction (spherical equivalent) was -1.28 sph OD and -1.07 sph OS. The average intraocular pressure was 14 mmHg in both eyes (OU). A patient had a dislocated lens OD; a patient had lens dislocation OU; and a patient had prosthesis OD and aphakia OS. Upon optical coherence tomography (OCT), the retinal nerve fiber layer (RNFL) average was 75.86 µm OD and 81.85 ​​µm OS; the average cup-to-disc (C/D) ratio was 0.41 and 0.35 in the right and left eye, respectively. Upon visual field testing, the average mean deviation (MD) was -6.27 dB OD and -8.55 dB OS. Our findings underscore the significant phenotypic and genotypic heterogeneity of patients with MFS in Puerto Rico. The identification of several mutations in the FBN1 gene in the Puerto Rican population demonstrates the need for an up-to-date approach to diagnose and co-manage patients with the syndrome. This study contributes to a deeper understanding of the genetic heritage of patients with the syndrome and highlights the potential for personalized therapeutic interventions.

Introduction and Validation of Low-Cost Ocular Biometry in Healthy and Cataractous Eyes Using a Thermally Tunable Swept-Source Laser

To introduce and validate a novel substantially lower-priced and rapid swept-source investigational optical biometer in healthy and cataractous eyes, using a thermally tuned laser diode used extensively in cell phones and data communication as an alternative swept source. Prospective accuracy, validity, and reliability analysis. A total of 60 eyes of 59 subjects (29 eyes of 29 healthy subjects and 31 eyes of 30 cataract patients) were enrolled in a prospective comparative study at the Vienna General Hospital between August 2021 and April 2023. Averaged intraocular distances were acquired in 2.5 seconds from datasets consisting of 5000 consecutive A-scans at a single position by a low-cost swept-source optical biometry (SSOB) system. Instrument repeatability was assessed via standard deviations (SDs) and coefficients of variation (CoVs) of parameters such as axial length (AL), anterior chamber depth (ACD), lens thickness (LT), and central corneal thickness (CCT). Healthy subjects and cataract patients were subsequently measured on the same day with the SSOB and a referential partial coherence interferometry (PCI) biometer (IOLMaster 500) to establish AL inter-device correlation (r) for instrument calibration. AL and ACD as shared parameters between both biometers were evaluated for their limits of agreements (LoA) using Bland-Altman analysis. Repeated measurements of AL, ACD, LT, and CCT revealed SDs of 18 µm, 12 µm, 12 µm, and 10 µm, respectively. All parameters except for CCT had a COV <1%. Except for 1 eye with white cataract, 59 eyes of 59 study participants with various degrees and types of cataract could be measured with both devices. The AL inter-device correlation was excellent (r > 0.99). The 95% LoAs between both biometers were -0.14 to 0.13 mm for AL and -0.28 to 0.25 mm for ACD. Optical biometry using a thermally tunable VCSEL swept-source light source has the potential to provide clinically relevant biometric parameters at an unprecedented 100-fold lower price point than currently used state-of-the-art optical biometers, paving the way for compact devices in remote care settings.

Outcomes of retropupillary iris claw lens implantation in patients with intraocular lens dislocation and low (less than 1000 cells/mm2) corneal endothelial cell density

BackgroundPosterior chamber intraocular lens (IOL) dislocation is a common complication of cataract surgery. Dislocated IOLs often require surgical intervention due to the potentially severe risks of leaving this condition untreated. If a patient with extremely low corneal endothelial cell density (ECD) presents with IOL dislocation, the surgeon faces a crucial dilemma of choosing the most optimal surgical treatment option. We sought to investigate the efficacy and safety of retropupillary iris claw intraocular lens (R-IOL) implantation in patients with IOL dislocation and extremely low (< 1000 cells/mm2) ECD.MethodsWe retrospectively reviewed the medical records of nine patients (all men) whose pre-operative ECD was < 1000 cells/mm2 and who underwent R-IOL implantation due to intraocular subluxation or total dislocation into the vitreous cavity between 2014 and 2020. We evaluated corneal endothelial function and visual outcomes after surgery.ResultsNine patients were included in this study. The mean age at diagnosis was 64.89 ± 7.15 years (range 57–76 years), and the follow-up duration was 37.93 ± 23.72 months (range 18.07–89.07 months). No patients developed bullous keratopathy during follow-up. Compared to the initial ECD, corneal thickness (CT), coefficient variation of cell area (CV) and percentage of hexagonal cells (HEX), there was no statistically significant decrease in the ECD, CV, and HEX at last follow-up (P = 0.944, 0.778, 0.445, 0.443). There was significant improvement in the mean uncorrected distance visual acuity (UDVA) at the last follow-up (average 0.13 logMAR, 20/27 Snellen) compared to the pre-operative mean UDVA (average 1.09 logMAR, 20/250 Snellen) (P < 0.01).ConclusionsR-IOL implantation did not result in a statistically significant decline in corneal endothelial function in patients with preoperatively low ECD, and it significantly improved the mean UDVA postoperatively. R-IOL implantation appears to be a safe and effective treatment modality for intraocular lens dislocation in patients with low ECD (< 1000 cells/mm²); however, long-term follow-up studies are warranted to corroborate these findings.

Comparative long-term outcomes of vitrectomy combined with anterior chamber intraocular lens to intra-scleral haptic fixation of posterior chamber intraocular lens

PurposeTo evaluate the long-term clinical outcomes in patients with combined pars plana vitrectomy (PPV) with anterior chamber intraocular lens (ACIOL) to intrascleral haptic fixation (ISHF) using the Agarwal technique with fibrin glue to secure the scleral flap of a posterior chamber intraocular lens.MethodsRetrospective, consecutive, single-center, comparative case series. 83 eyes were studied. Patients with < 8 months of follow-up were excluded. Detailed pre-, intra-, and post-operative complications were analyzed using mixed model univariate analysis and t-test. Pre- and post-operative best corrected visual acuity (BCVA) was analyzed.ResultsTwenty-five subjects met entry criteria. Mean age at time of surgery was 70.4 ± 17.7 years in the ACIOL group (n = 12) and 54.6 ± 21.1 years in the ISHF group (n = 13; p = 0.03). Mean follow-up was 38.2 months. Incidence of corneal decompensation was similar in the ACIOL and ISHF lens group (p = 0.93). There was no difference in the BCVA mean change or cystoid macular edema (CME) at the final visit between the groups (p = 0.47; p = 0.08), but there was a trend toward increased CME in the ACIOL group.ConclusionsPPV with concomitant placement of either ACIOL or ISHF lens result in improvement in BCVA. Both procedures are well tolerated and result in favorable outcomes with long-term follow-up though varying patient populations do not allow precise comparison between the two groups.

Frequency of retinal detachments in dogs after prophylactic transpupillary retinopexy.

To evaluate the frequency of retinal detachments following prophylactic transpupillary retinopexy (PTPRP). The medical records of dogs that received a PTPRP between 2014 and 2022 were retrospectively analyzed for age, sex, breed, reason for retinopexy, laser power setting, number of retinal burns, follow-up duration, and outcome. Laser power settings were increased until retinal burns could be visualized and were made 360° in a double row in the peripheral retina. Fifty-seven cases (75 eyes), 28 males and 29 females, had PTPRP performed. The median age was 8 years (4 months-14 years) with Shih tzu (n = 12), Bichon (n = 5), Miniature Poodle (n = 5), and Yorkie (n = 4) being the most common breeds. PTPRP were performed due to severe vitreal degeneration (n = 66), retinal detachment in the contralateral eye (n = 25), capsular tear with escaped lens material during phacoemulsification (n = 6), intracapsular lens extraction (n = 2), and lens luxation during phacoemulsification (n = 3). The median power setting, number of retinal burns, and follow-up time were 300 mW (201-595 mW), 210 burns (35-921 burns), and 473 days (14-1862 days), respectively. Additionally, five patients had a barrier-pexy performed in the contralateral eye, due to partial detachment. Retinal detachment occurred in 3/75 (4.0%) of eyes that received a PTPRP at the final examination. Of the patients with a detachment in the contralateral eye (n = 25), no detachment was noted at the last follow-up examination. Two partial detachments that had barrier-pexies had progressed at the final examination. These results demonstrate that PTPRP may be beneficial in decreasing the risk of retinal detachment in selected cases.

High-risk factors for zonular complications during cataract surgery in eyes with pseudoexfoliation syndrome

AimsTo predict high-risk factors for zonular complications during cataract surgery due to pre-existing severe zonular dehiscence in eyes with pseudoexfoliation (PXF) syndrome.Methods315 eyes of 315 consecutive patients with PXF scheduled...

Lens height paraments comparison according to ciliary sulcus width (CSW): a pilot study of the predictive role of CLR and STSL for vault after ICL implantation

BackgroundTo assess the relationship between postoperative implantable collamer lens (ICL) vault and lens height obtained from two different measurements.MethodsA retrospective case series study enrolled eyes with horizontally implanted ICL. Crystal lens rise (CLR) and the distance between STS plane and anterior crystalline lens surface (STSL) were measured in the horizontal and vertical directions using ultrasound biomicroscopy (UBM). We compared the differences in the parameters measured in both horizontal and vertical directions. The participants were categorized into three groups according to ciliary sulcus width (CSW) which is defined as the distance between the posterior angle of the iris and the anterior angle of the ciliary process: narrow CSW group (NSG); medium CSW group (MSG); and wide CSW group (WSG). The correlations between CLR/STSL and vault were examined in each of the three groups. Biased correlation analysis was used further to contrast the correlation between CLR/STSL and vault.ResultsThis retrospective study included 223 myopic eyes. Vertical STSL (VSTSL) and vertical CLR (VCLR) exhibited significantly greater values compared to their horizontal counterparts (both P < 0.05). None of the indicators were statistically different between the three groups. In both NSG and MSG, STSL/CLR correlated with vault, while in WSG, only STSL correlated with vault (r=-0.316, P = 0.013). In contrast to HCLR, the correlation between HSTSL and vault remained after controlling for HCLR (r=-0.162, P = 0.015).ConclusionsSTSL should deserve more attention in the preoperative evaluation of ICL compared to CLR especially when CSW is large.