COMPARISON OF FUNCTIONAL AND STRUCTURAL AREAS IN HUMAN FOVEA. I. METHOD OF ENTOPTIC PLOTTING

Abstract

The feasibility of plotting the foveal area in man from entoptic images and by a method similar to that long used in plotting eye fields on a tangent screen is demonstrated and validated by this study. The type of filters best suited to revealing persistent entoptic images of the fovea and a technique of examination are descr. The findings reported on a group of 20 young men indicate that the typical fovea has an outside diameter of 2.5-3[degree] and is made up of 3 concentric zones. These 3 zones, functionally quite distinct, differ from each other in their color responses. The relation of macular pigment to the foval zones is discussed. The opportunity and need for correlational studies across the fovea centralis and the outer fovea to reveal the relations between functional phenomena and neuro-structural identifications is presented.