Impact of the pupil size – central optical zone diameter relationship on visual performance in aspheric multifocal contact lenses
| Autor: | AM García-Del Valle, Santiago García-Lázaro, Cristian Talens-Estarelles |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
medicine.medical_specialty
Visual acuity genetic structures Contact Lenses media_common.quotation_subject Visual Acuity Pupil diameter Near visual acuity Cycles per degree Contrast Sensitivity Double-Blind Method Ophthalmology medicine Humans Contrast (vision) Prospective Studies media_common Mathematics Pupil size Pupil General Medicine Middle Aged eye diseases Spatial frequency medicine.symptom Optometry Photopic vision |
| Zdroj: | Contact Lens and Anterior Eye. 45:101440 |
| ISSN: | 1367-0484 |
| Popis: | Purpose To determine the impact of different central optical zone diameters (COZDs), obtained from pupil size, on the visual performance of presbyopic subjects fitted with centre-distance simultaneous-image multifocal contact lenses (SIMCLs). Methods Thirty-two presbyopic volunteers, between 45–58 years of age, participated in this prospective, controlled, double-blind study. Subjects were fitted with 5 centre-distance SIMCLs of variable COZD, determined from the measurement of pupil size under photopic light conditions and corresponding to 60, 70, 80, 90 and 100 % of pupil diameter. Subjects visual performance was evaluated through the measurement of distance, intermediate and near visual acuity (VA), “visual functional range” (VFR) obtained from the VA Defocus Curve (VADC) and Contrast Sensitivity Function (CSF), using a third-generation retina display iPad. Results Statistically significant differences were obtained for both distance (p = 0.01) and intermediate (p = 0.001) VA amongst designs. Best results were obtained with 80 % and 90 % COZDs compared to 60 %. No significant differences in VFR (p > 0.05) were obtained amongst the different COZDs. 90 and 100 % COZDs offered statistically significant better results at 6 and 18 cycles per degree (cpd) in the CSF, compared to the 60 and 70 % designs. Conclusions SIMCLs with COZDs of 80–90 % and of 90–100% of photopic pupil diameter offered better distance and intermediate VA, without a decline in near performance, and superior contrast sensitivity at medium and high spatial frequencies respectively, compared to lower COZD designs. |
| Databáze: | OpenAIRE |
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