Title

Distribution of light on the human retina

Document Type

Thesis

Degree

Master of Science (MS)

Department

Physics

First Advisor's Name

Richard Bone

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Xuewen Wang

Third Advisor's Name

Yesim Darici

Fourth Advisor's Name

John Landrum

Date of Defense

7-24-2001

Abstract

The purpose of this study was to determine whether or not the irradiance of the human retina is maximum at its center. This question is related to a disease called aged-related macular degeneration (AMD) which affects, as its name suggests, the central part of the retina (macula). If the irradiance is higher on the macula, this could explain why solar environmental light increases the probability of the appearance of AMD in elderly people.

Three different experiments were designed in order to find the irradiance on the human retina. The same subject was used, in all the experiments. Basically, the experiments consisted of recording the subject’s gaze position and pupil size when she was looking at predefined regions of different luminance.

By using a mathematical model for a theoretical eye, the values of retinal irradiance were found suggesting the hypothesis that the higher values are located near the central part of the retina. A qualitative representation of retinal irradiance was also found. These maps represent, using different gray tonalities, the irradiance on the subjects’ retina when they were examining black and white photographs. The results obtained can help in the understanding of sun-related eye diseases, in particular AMD.

Identifier

FI14062274

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