An Analysis of Retinal Receptor Orientation

IV. Center of the Entrance Pupil and the Center of Convergence of Orientation and Directional Sensitivity

¹ Department of Ophthalmology and the Oscar Johnson Institute, Washington University School of Medicine, 660 S. Euclid Ave., St. Louis, Mo. 63110.

In the previous study, we related the peaks of photopic directional sensitivity (Stiles-Crawford) functions determined, across the retina to the center of the dilated entrance pupil. It was found that the peaks of directionality were oriented toward a point in close proximity to the center of the dilated exit pupil of the eye. Here we consider whether this center of convergence of orientation and directional sensitivity (projected to the plane of the entrance pupil) bears an improved relationship to the center of the constricted entrance pupil, on the chance that the dilated and constricted entrance pupils in the same observer have different centers. In the three normal observers tested, the small variations in pupil centration recorded with change in pupil size did not further clarify the result. The constricted pupil when compared to the dilated pupil shifted slightly nasal and/or upward.

Key Words: vision • retina • directional sensitivity of the eye • Stiles-Crawford effect • retinal receptor orientation • mydriasis • miosis • center of the entrance and the exit pupils of the eye • corneal reflex • center of convergence of orientation and directional sensitivity

Submitted on June 26, 1972
Accepted on August 30, 1972

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