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Related Experiment Video

Updated: Jun 2, 2026

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Published on: March 3, 2023

Accommodative amplitude required for sustained near work.

James S Wolffsohn¹, Amy L Sheppard, Sanjay Vakani

¹Aston University, School of Life and Health Sciences, Ophthalmic Research Group and Aston Research Centre for Health Ageing, Birmingham, UK. j.s.w.wolffsohn@aston.ac.uk

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)

|May 4, 2011

Summary

This summary is machine-generated.

The human eye

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Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Prescription of near vision additions often assumes limited sustainable amplitude of accommodation.
Understanding accommodative system robustness is crucial for effective presbyopic correction.

Purpose of the Study:

To investigate the sustainability of the pre-presbyopic accommodative system during sustained near vision tasks.
To determine how much eye focus is required for adequate presbyopic correction.

Main Methods:

21 pre-presbyopic volunteers underwent binocular subjective amplitude of accommodation testing (RAF rule) before and after a 30-minute reading exercise.
Near reading distance, pupil size, and accommodative accuracy to various diopter stimuli were objectively measured using an open-view autorefractor.

Main Results:

Amplitude of accommodation and accommodative accuracy remained statistically unchanged post-exercise.
Mean accommodation exerted was 80.6%, increasing with task duration and subject age.
No significant change in accommodative accuracy or amplitude was observed.

Conclusions:

The pre-presbyopic accommodative system demonstrates robustness against fatigue during prolonged, intensive near work.
A larger proportion of the amplitude of accommodation can be sustained continuously than previously believed.