A New Method for Assessing Central and Peripheral Visual Acuity

Abstract

This research aims to assess central and peripheral visual acuity. We assume that visual acuity will be decreased in peripheral vision because the density of human photoreceptor cone cells diminishes exponentially. We designed a program to measure visual acuity two different models (minimum discernible, minimum separable) According to distance between subject’s eye and screen, the program has 3 cases (basic, release, accumulate model), which are classified by position of nodal points. In addition, there is a selection of four different line patterns to define visual field. After all these options are selected, the program displays various-sized circles (discernible model) and Landolt rings (separable model) on the locations of screen corresponding to the visual angle. As a result of experiment, we obtained distribution of visual acuity according to the visual angle. Further, we are able to gain more accurate graph using high-resolution projector and getting higher brightness of circles and Landolt rings.