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Neuronal adaptation to simulated and optically-induced astigmatic defocus.

Arne Ohlendorf¹, Juan Tabernero, Frank Schaeffel

¹Institute for Ophthalmic Research, Section of Neurobiology of the Eye, Calwerstrasse 7/1, 72076 Tübingen, Germany. arne.ohlendorf@klinikum.uni-tuebingen.de

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|February 8, 2011

Summary

Adaptation to astigmatic defocus improves visual acuity. This visual adaptation is specific to the axis of astigmatism, suggesting a selective recalibration of visual processing.

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Area of Science:

Vision Science
Neuroscience
Ophthalmology

Background:

Spatial adaptation enhances visual acuity with spherical defocus.
Adaptation to astigmatic defocus is less understood.
Investigating adaptation to simulated and real astigmatic defocus.

Purpose of the Study:

Quantify visual adaptation to astigmatic defocus.
Determine if adaptation is selective for the astigmatic axis.
Compare adaptation to simulated versus optically-induced astigmatism.

Main Methods:

Ten subjects (myopic and emmetropic) adapted to astigmatic defocus (+3D).
Adaptation involved watching a movie with simulated or real astigmatic defocus.
Visual acuity was tested with aligned and rotated astigmatic axes.

Main Results:

Adaptation significantly improved visual acuity for both simulated and real astigmatic defocus.
Axis rotation during testing abolished significant visual acuity improvement.
Results indicate axis-selective adaptation to astigmatic defocus.

Conclusions:

Visual adaptation to astigmatic defocus occurs.
Adaptation is selective for the meridian of astigmatism.
Suggests recalibration of spatial filters in the visual system.