All ETDs from UAB

Advisory Committee Chair

Lawrence C Sincich

Advisory Committee Members

John M Laurent

Lei Liu

Document Type


Date of Award


Degree Name by School

Master of Science (MS) School of Optometry


In human eyes, accomodation brings light rays into focus on the retina in order to achieve a clear images. The plane of best focus within the depth of the retina is thought to be within the photoreceptor layer, but pinpointing the exact focal position axially has not been determined. With help of adaptive optics aberration correction and its ability to have microscopic control of a retinal stimulus, we explored how sensitive human subjects are to defocus on the micron scale. We found that focal position can be reliably judged within 0.02 D, which is equivalent to about 6 microns in axial depth for a human eye.

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