Patent ID: 7883211

Claim:
A subjective vision testing system for testing visual functions of eyes of an examinee, comprising: an optometric unit having right and left test windows for selectively disposing optical elements including rotary prisms in front of right and left eyes of the examinee; an optotype presenting unit for presenting an optotype to the examinee, the optotype presenting unit being to be disposed at a predetermined distance apart from the optometric unit and having a memory for storing image data of various optotypes and a first color display for displaying the optotype of image data read from the memory; a controller having various keys for inputting various command signals and a second display for displaying optometric information; a first control part for controlling the optotype presenting unit to present an optotype for a binocular balance test at a center of a screen of the first display based on a command signal to execute the binocular balance test from the controller, the optotype for the binocular balance test including a plurality of first letter or symbol optotypes arranged in a single horizontal row and second figure optotypes for fusion stimulus arranged in pair above and below the first optotypes and having the same shape, size, and color; and a second control part for controlling the optometric unit to dispose, based on the command signal to execute the binocular balance test, a first rotary prism in the right test window in front of the right eye of the examinee and a second rotary prism in the left test window in front of the left eye of the examinee, the second prism having a base direction vertically opposite to that of the first rotary prism and the same prism power as the first rotary prism.