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The effect of ocular aberrations on steady-state errors of accommodative response
Sotiris Plainis1, Harilaos S Ginis, Aristophanis Pallikaris
1VEIC, Dept. of Ophthalmology, School of Medicine, University of Crete, Greece. plainis@med.uoc.gr
Journal of Vision
|August 16, 2005
Summary
Accommodation errors are common and linked to changes in eye aberrations. Fluctuations in focus may help maintain image quality despite these accommodative lags.
Area of Science:
- Ophthalmology
- Vision Science
- Physiological Optics
Background:
- The human eye's accommodation system exhibits steady-state focus errors.
- Understanding these errors is crucial for visual optics and ophthalmic lens design.
Purpose of the Study:
- To correlate accommodation errors with dynamic changes in ocular wavefront aberrations.
- To investigate the impact of these aberrations on image quality during accommodation.
Main Methods:
- Utilized the Complete Ophthalmic Analysis System (COAS) and a Badal optometer for continuous wavefront aberration recording.
- Measured accommodative response by optimizing wavefront error and modulation transfer function across accommodative demands up to 8 D.
- Analyzed data from seven subjects, with 50 recordings per subject.
Main Results:
- Confirmed previously reported changes in ocular aberrations, such as the shift to negative spherical aberration, with increasing accommodation.
- Observed significant intersubject variability in accommodation errors (lag) for near targets.
- Demonstrated that higher-order aberrations influence accommodative demand.
Conclusions:
- A one-to-one stimulus/response slope in accommodation is not always ideal due to aberration influences.
- Spherical aberration changes significantly impact accommodative demand.
- Fluctuations in focus may be a mechanism to preserve image quality during moderate accommodation errors.
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