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Related Experiment Video

Updated: May 29, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Accommodation: its relation to refractive errors, amblyopia and biometric parameters.

R Maheshwari¹, R R Sukul, Y Gupta

¹Department of Physiology, Aligarh Muslim University, Aligarh, India.

Nepalese Journal of Ophthalmology : a Biannual Peer-Reviewed Academic Journal of the Nepal Ophthalmic Society : NEPJOPH

|August 31, 2011

Summary

This study found that corrected low myopes exhibit the highest amplitude of accommodation, while hypermetropes and amblyopic eyes show significantly lower amplitudes. Anatomical changes include decreased anterior chamber depth and increased lens thickness during accommodation.

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Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Accommodation is crucial for clear near vision.
Refractive errors and amblyopia can impact accommodative ability.
Understanding anatomical changes during accommodation is key to visual function.

Purpose of the Study:

To investigate the amplitude of accommodation in relation to refractive errors and amblyopia.
To measure anatomical changes within the eye during the accommodative process.
To correlate refractive error severity with accommodative amplitude and anatomical shifts.

Main Methods:

Amplitude of accommodation (AA) measured using the Royal Air Force (RAF) rule in 150 patients (ages 11-30).
Included emmetropes, myopes, hypermetropes, and hypermetropic amblyopes, categorized by refractive error severity.
Anterior chamber depth (ACD), axial length (AxL), and lens thickness (LT) changes assessed via A-scan during accommodation.

Main Results:

Corrected low myopes demonstrated the highest AA, followed by emmetropes; corrected hypermetropes had the lowest AA.
The amblyopic eye showed significantly reduced AA compared to the non-amblyopic eye.
Accommodation led to decreased ACD and increased LT. AxL increased most in myopes, but not significantly in hypermetropes.

Conclusions:

The amblyopic eye's low accommodation amplitude supports the use of near adds for amblyopic patients.
Increased axial length due to prolonged near work may contribute to myopia development in susceptible individuals.