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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

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Changes in accommodative responses with multifocal contact lenses: a pilot study.

David Madrid-Costa¹, Javier Ruiz-Alcocer, Hema Radhakrishnan

¹Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain. davidmadridcosta@hotmail.com

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|September 20, 2011

Summary

This summary is machine-generated.

Multifocal contact lenses (CLs) showed minimal impact on the accommodative system in young adults. These specialized CLs did not significantly alter pupil or accommodative responses compared to single vision lenses.

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Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Multifocal contact lenses (CLs) are increasingly prescribed for presbyopia correction.
Understanding their impact on the visual system, particularly accommodation and pupil response, is crucial for optimizing patient outcomes.
Previous research has yielded varied results regarding the physiological effects of multifocal CLs.

Purpose of the Study:

To investigate and compare the induced changes in pupil and accommodative responses.
To evaluate these changes across different accommodative stimuli (-2.5 D and -4.00 D).
To assess the effects of three specific aspheric multifocal CL designs.

Main Methods:

Ten young subjects participated in the study.
Accommodative and pupil responses were measured using a Hartmann-Shack aberrometer.
Monocular measurements were taken with distance-single vision CLs and three multifocal CLs (PureVision Low Add, PureVision High Add, Focus Progressives) under two accommodative stimuli.

Main Results:

No significant differences in accommodative response were observed between multifocal CLs and single vision lenses for either stimulus.
Peak velocity and time constant of accommodation showed no significant differences, except for PureVision Low Add at -4.00 D.
Pupil constriction amplitude was only significantly reduced with PureVision High Add at -2.5 D.

Conclusions:

The studied multifocal contact lenses do not induce substantial alterations in the accommodative system of young individuals compared to single vision lenses.
These findings suggest that multifocal CLs can be a viable option for young myopes needing near vision correction without significant visual function compromise.
Further research with larger cohorts and varied populations is warranted to confirm these pilot study results.