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Related Experiment Video

Updated: Jun 23, 2026

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

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Published on: March 3, 2023

Role of ocular aberrations in dynamic accommodation control.

Sem Sem Chin¹, Karen M Hampson, Edward A H Mallen

¹Bradford School of Optometry and Vision Science, University of Bradford, Bradford, West Yorkshire, United Kingdom.

Clinical & Experimental Optometry

|May 23, 2009

Summary

Ocular aberrations, particularly even-order ones, play a crucial role in guiding accurate accommodation responses. Inverting these aberrations disrupts the eye's ability to adjust focus, leading to incorrect responses during visual tasks.

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Area of Science:

Ophthalmology
Vision Science
Optometry

Background:

Accommodation control relies on cues like blur, chromatic aberration, and target proximity.
Ocular aberrations shift with accommodative demand, notably spherical aberration.
Adaptive optics studies suggest aberrations influence accommodation in some individuals.

Purpose of the Study:

To investigate the impact of correcting and inverting ocular aberrations on accommodation control.
To determine the relative influence of aberration manipulation on dynamic accommodation responses.

Main Methods:

An adaptive optics system modified ocular aberrations in five participants.
Participants viewed targets with stepwise vergence changes (0.5 D).
Aberrations were manipulated (unchanged, corrected, inverted), and accommodative responses were recorded using a Shack-Hartmann wavefront sensor.

Main Results:

Aberration correction did not significantly affect dynamic accommodation.
Inverting even-order aberrations reduced accommodative response gain for outward steps.
Aberration inversion increased incorrect directional responses during disaccommodation (outward steps).

Conclusions:

Even-order ocular aberrations provide cues for guiding accommodation, especially during disaccommodation.
Aberrations are critical for determining the initial direction of stepwise accommodation responses.
Manipulating aberrations, particularly even-order ones, significantly impacts accommodative accuracy.