Measure Of Functional Vision Under Simulated Conditions Of Common Visual Impairments.

It is difficult for the average person with normal vision to understand how the ability to perform normal daily functions is nagatively affected with any visual impairment. Therefore, the following study was conducted in which three types of visual impairments were simulated. They included general blur, a central scotoma, and hazy media opacification. Under these conditions, the maximum distance at which a subject could perform the three ordinary tasks of facial recognition, reading the face of a wall clock, and watching television were recorded. From these measurements of distances, one can see how functional ability is reduced with various types of visual impairment; and also how different types of visual impairment affect functional vision in various ways.