Spherical Intraocular Lens Implantation Research Articles

Assessment of contrast sensitivity and wavefront analysis after aspheric and spherical intraocular lens implantation.

Assessment of contrast sensitivity and wavefront analysis after aspheric and spherical intraocular lens implantation.

Comparison of visual quality after the implantation of different types of intraocular lens

Objective To compare the efficacy of different types of intraocular lens (IOL) implantation for age-related cataract. Methods A retrospective case series. Clinical data of 148 eyes of 162 cases of age-related cataract, were collected from April to December in 2014 at our hospital and all subjects were divided into three groups: simple cataract surgery combined with the traditional spherical IOL implantation in 44 eyes, zero spherical aberration AO IOL implantation in 56 eyes and negative spherical aberration ZCB IOL implantation in 48 eyes. The differences in patients age, preoperative uncorrected distance visual acuity and axial length among three groups were not statistically significant (P>0.05). The corneal astigmatism of all patients were less than 0.75 D. Uncorrected distance visual acuity (UCVA), best corrected distance visual acuity (BCVA), uncorrected near visual acuity (UNVA) and best corrected near vision (BCNA) were assessed preoperatively, 1 week, 1 month and 3 months after the surgery. And the ocular spherical aberration of the patients in 3 groups were assessed 3 months after the surgery. The total ocular spherical aberration of all subjects were measured by using the Ray tracing methed with pupil diameters of 4.0 mm. Results After three months, there were not statistically significant differences in UCVA, BCVA, UNVA and BCNA among three groups. After three months there was statistically significant difference among groups in total ocular spherical aberration. According to the data of corneal spherical aberration, the total ocular spherical aberration of patients in each group was divided into 3 grades. It is founded that the total ocular spherical aberration had no statistically significant defferences among groups when the corneal spherical aberration grade was less than 0.15 μm or greater than 0.45 μm. However, there was statistically significant difference when corneal spherical aberration grade was from 0.15 m to 0.45 μm. Conclusion Our earlier observation shows that negative spherical aberration IOL implantation is superior to traditional spherical IOL and aspheric IOL. Key words: Lens, intraocular, various types; Spherical aberration; Visual quality; Comparation

Comparison of Visual Quality between Aspheric and Spherical IOLs

To determine if aspheric intraocular lens (IOL) implantation produces the same degree of postoperative ocular aberration and contrast sensitivity as spherical IOL implantation. In this randomized prospective comparative study, 60 eyes of 30 cataract surgery patients were randomly assigned to receive a spherical IOL (Rayner 620H) in one eye and an aspheric IOL (Rayner 920H) in the contralateral eye. All patients were examined at 1 month postoperatively. Primary outcomes of contrast sensitivity and ocular wavefront higher order aberrations (HOAs) were assessed. Aspheric IOLs (median total HOAs 0.26 root mean square [RMS]; range 0.13-0.82 RMS) produced significantly lower total HOAs than spherical IOLs (median total HOAs 0.34 RMS; range 0.18-1.08 RMS; p<0.05). Contrast sensitivity was significantly better with aspheric IOLs (median contrast sensitivity 1.8 log units; range 1.35-1.8 log units) than with spherical IOLs (median contrast sensitivity 1.65 log units; range 1.35-1.8 log units; p<0.05). When compared with a structurally (platform and material) similar spherical IOL (Rayner 620H), aspheric IOLs (Rayner 920H) appear to significantly reduce HOAs and yield better levels of contrast sensitivity under photopic conditions.

The Impact on Vision of Aspheric to Spherical Monofocal Intraocular Lenses in Cataract Surgery: A Systematic Review with Meta-analysis

<h3>Purpose</h3> To provide a summary of the impact on vision of an aspheric intraocular lens (IOL) compared with a spherical IOL in cataract surgery. <h3>Design</h3> Systematic review with meta-analysis. <h3>Participants</h3> Patients from published randomized controlled trials (RCTs) of cataract surgery with aspheric compared with spherical monofocal IOL implantation. <h3>Methods</h3> We systematically searched the peer-reviewed literature in MEDLINE, EMBASE, Web of Science, BIOSIS, and the Cochrane Library according to the Cochrane Collaboration method to identify relevant RCTs. The inclusion criteria were RCTs on cataract surgery comparing the use of aspheric versus spherical IOL implantation that assessed visual acuity, contrast sensitivity, or quality of vision. The effects were calculated as mean differences or standardized mean differences (Hedges' g) and pooled using random-effect models. <h3>Main Outcome Measures</h3> Best-corrected visual acuity (BCVA), contrast sensitivity, and subjective perception of the quality of vision. <h3>Results</h3> Forty-three studies provided data and were included, comprising 2076 eyes implanted with aspheric IOLs and 2034 eyes implanted with spherical IOLs. The BCVA showed a significant difference for aspheric IOLs (−0.01 logarithm of the minimum angle of resolution; 95% confidence interval [CI], −0.02 to −0.00). For contrast sensitivity, a significant advantage for aspheric IOLs was found under photopic and mesopic light conditions (photopic: Hedges' g 0.42, 95% CI 0.24–0.61 (3 cycles per degree [cpd]) to 0.53, 95% CI 0.33–0.73 (12 cpd); mesopic: Hedges' g 0.49, 95% CI 0.23–0.75 (1.5 cpd) to 0.76, 95% CI 0.52–1.00 (18 cpd)). Questionnaires targeting the subjective perception of quality of vision yielded less conclusive results. <h3>Conclusions</h3> Overall, a patient may achieve better contrast sensitivity with an aspheric IOL than with a spherical IOL, especially under dim light. There was no clinically relevant difference in BCVA between aspheric and spherical IOL implantation. The findings on the subjective perception of visual quality were heterogeneous with no clear result favoring either option. <h3>Financial Disclosure(s)</h3> The author(s) have no proprietary or commercial interest in any materials discussed in this article.

Astigmatism correction with toric intraocular lenses: wavefront aberrometry and quality of life

Background/aimTo evaluate wavefront aberrations and subjective quality of life after toric intraocular lens (TIOL) implantation.MethodsThree groups of subjects who underwent unilateral cataract surgery with intraocular lens (IOL) implantation were compared:...

Visual quality after diffractive intraocular lens implantation in eyes with previous hyperopic laser in situ keratomileusis

To evaluate distance, intermediate, and near visual quality in eyes with diffractive intraocular lens (IOL) implantation after previous hyperopic laser in situ keratomileusis (LASIK). Fernández-Vega Ophthalmological Institute, Oviedo, Spain. Cohort study. Corrected distance visual acuity (CDVA) at 12.5%, 25.0%, and 100% contrast levels under photopic and mesopic conditions; uncorrected (UNVA) and distance-corrected (DCNVA) near visual acuity, defocus curves, and corneal higher-order aberrations (HOAs) were measured in eyes that had AcrySof Restor SN60D3 spherical IOL implantation (study group) and in phakic eyes (control group) after hyperopic LASIK. Under photopic conditions at 100% contrast, there were no statistically significant differences between the 2 groups (P > .01) and the CDVA was 0.1 logMAR or better (approximately 20/25) in both groups. At 25.0% and 12.5% contrast, there were no statistically significant differences between the 2 groups (P > .01). Under mesopic conditions, the control group had better CDVA than the study group without glare at all contrasts (P < .01). In the study group, the mean UNVA was 0.017 logMAR ± 0.030 (SD) (approximately 20/20) and the mean DCNVA, 0.009 ± 0.030 logMAR. There was statistically significant worsening of visual acuity as a function of the distance to the test (P < .01). There were no statistically significant differences in HOAs between the 2 groups (P > .01). In eyes with previous hyperopic LASIK, the diffractive IOL provided good visual quality at distance, comparable to that obtained in phakic eyes under photopic conditions, although visual performance was slightly poorer under mesopic conditions. No author has a financial or proprietary interest in any material or method mentioned.

Comparison of toric intraocular lenses and peripheral corneal relaxing incisions to treat astigmatism during cataract surgery

To evaluate and compare toric intraocular lens (IOL) implantation and spherical IOL implantation with peripheral corneal relaxing incisions to manage astigmatism during phacoemulsification. Ophthalmology Service, Hospital Ramón y Cajal, Madrid, Spain. Prospective randomized comparative case series. Eyes with cataract and corneal astigmatism (1.00 to 3.00 diopters [D]) had toric IOL implantation or peripheral corneal relaxing incisions. Outcome measures were visual outcomes, slitlamp assessment, digital toric IOL axis determination, spectacle need, and patient satisfaction. Three months postoperatively, the mean uncorrected distance visual acuity (UDVA) was 0.13 ± 0.10 (SD) in the toric IOL group and 0.19 ± 0.12 in the relaxing incisions group; the UDVA was better than 0.20 in 75% of eyes and 60% of eyes, respectively. Refractive cylinder decreased significantly in both groups, with a mean residual refractive astigmatism of 0.61 ± 0.41 D in the toric IOL group and 1.32 ± 0.60 D in the relaxing incisions group (P<.01). The mean toric IOL rotation was 3.65 ± 2.96 degrees, with no significant differences between slitlamp and digital photograph measurements. There was a trend toward better mesopic contrast sensitivity with glare in the toric IOL group. There were no differences in VF-14 or patient satisfaction results; 15% of patients in the toric IOL group and 45% in the relaxing-incision group required distance spectacles postoperatively. Although refractive astigmatism decreased in both groups, toric IOL implantation was more effective and predictable, resulting in greater spectacle independence.

Influence of spherical intraocular lens implantation and conventional laser in situ keratomileusis on peripheral ocular aberrations

To measure the effect of spherical intraocular lens (IOL) implantation and conventional myopic laser in situ keratomileusis (LASIK) on peripheral ocular aberrations. Visual and Ophthalmic Optics Laboratory, School of Optometry, and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia. Peripheral aberrations were measured using a modified commercial Hartmann-Shack aberrometer across 42 degrees x 32 degrees of the central visual field after spherical IOL implantation and after conventional LASIK for myopia. The results were compared with those in an age-matched emmetropic group and an age-matched myopic control group, respectively. The rate of quadratic change in spherical equivalent (SE) refraction, higher-order root-mean-square (RMS) aberrations, and total RMS aberrations across the visual field was greater and the amount of spherical aberration higher in the IOL group than in the emmetropic control group. However, coma trends were similar in the 2 groups. The rate of quadratic change in SE refraction, higher-order RMS aberrations, and total RMS aberrations was greater across the field and the amount of spherical aberration higher in the LASIK group than in the myopic control group. The trend in coma across the field in the LASIK group was opposite that in the other groups. Spherical IOL implantation and conventional myopic LASIK increased ocular peripheral aberrations, causing a significant increase in spherical aberration across the visual field. Laser in situ keratomileusis reversed the sign of the rate of change in coma across the field relative to that in the other groups. No author has a financial or proprietary interest in any material or method mentioned.

Toric intraocular lens versus opposite clear corneal incisions to correct astigmatism in eyes having cataract surgery

To compare toric intraocular lens (IOL) implantation with paired opposite clear corneal incisions (OCCIs) for astigmatism correction in patients having cataract surgery. Ophthalmology Service, Donostia Hospital, San Sebastián, Spain. This randomized prospective clinical study comprised eyes with more than 1.00 diopter (D) of preexisting corneal astigmatism. One group had AcrySof toric IOL implantation and the other, paired 2.75 mm/3.20 mm OCCIs in the steep axis with spherical IOL implantation. Uncorrected (UCVA) and best corrected (BCVA) visual acuity, refraction, corneal and total higher-order aberrations (HOAs), photopic and mesopic contrast sensitivity, and toric IOL axis were measured 3 months postoperatively. Forty eyes (40 patients) were evaluated. In the toric group, 95% of eyes achieved 20/40 or better UCVA and 70%, 20/25 or better. In the OCCI group, 80% of eyes achieved 20/40 or better UCVA and 50%, 20/25 or better. All eyes achieved 20/25 or better BCVA. Mean refractive cylinder decreased significantly from preoperatively to postoperatively (-1.75 +/- 0.71 to -0.62 +/- 0.46 D, toric group; -1.61 +/- 0.67 to -0.97 +/- 0.51 D, OCCI group) (P<.01). In the toric group, 95% and 100% of eyes were within +/-0.50 D for J(0) and J(45), respectively. In the OCCI group, the percentages were 70% and 100%, respectively. No significant differences in HOA were found between groups (P>.1). Contrast sensitivity was similar except at the highest spatial frequency, being better in the toric group (P<.01). Toric IOL implantation achieved a slight enhanced effect over OCCIs in treating preexisting astigmatism.