Influences of AC/A ratio and accommodation facility on near vision in presbyopic individuals: A prospective study done on North Indian population by comparing the presbyopic glass users with nonglass users
Background: “Presbyopia” is the most common age-related condition of progressive loss of accommodative ability, typically occurs around the fourth decade of life. Accommodative convergence (AC) and accommodation facility (AF) are essential for near vision and play a significant role in presbyopia. O...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2025-01-01
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| Series: | Journal of Clinical Ophthalmology and Research |
| Subjects: | |
| Online Access: | https://journals.lww.com/10.4103/jcor.jcor_128_24 |
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| Summary: | Background:
“Presbyopia” is the most common age-related condition of progressive loss of accommodative ability, typically occurs around the fourth decade of life. Accommodative convergence (AC) and accommodation facility (AF) are essential for near vision and play a significant role in presbyopia.
Objectives:
The study aim was to evaluate the influences of Accommodative convergence/accommodation (AC/A) ratio and binocular AF for near vision in presbyopics, by comparing near-glass users and nonglass users.
Materials and Methods:
This cross-sectional, comparative study included 192 patients aged between 38 and 48 years, with 96 patients each in Group A (glass users) and Group B (nonglass users). Distance and near visual acuity were measured using Snellen’s and Jaeger’s charts, respectively. AC/A ratio and binocular AF were assessed by heterophoria method and manual flipper (+2.00/−2.00D lenses), respectively. Statistical analysis was done by SPSS software.
Results:
Mean ± standard deviation age in glass users and nonglass users was 42.41 ± 2.77 and 43.06 ± 2.98 years, respectively; whereas the mean AC/A ratio was 4.07∆D and 3.91∆D, respectively; P = 0.020. The mean binocular AF for distance in glass users and nonglass users was 16.70D and 13.97D, respectively; P = 0.000. Mean binocular AF for near in glass users and nonglass users was 13.72D and 14.00D, respectively, with P = 0.241.
Conclusions:
Our study concludes that wearing of near glasses in presbyopic individuals was associated with a higher deviation of eyes for distance and AC/A ratio with better distance binocular AF; however, wearing of near glasses does not seem to significantly affect the deviation of eyes for near or binocular AF for near objects. |
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| ISSN: | 2320-3897 2320-3900 |