OPTOTYPE PRESENTING APPARATUS
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United States of America Patent
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app pub date -
Mar 28, 2012
filing date -
Mar 31, 2011
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Abstract
An optotype presenting apparatus presents optotypes for testing an examinee's binocular visual function. The apparatus includes: an optotype presenting part to display an optotype at a predetermined presenting region; a pupillary distance input part that inputs a pupillary distance between an examinee's left and right eyes; and a control unit that makes the optotype presenting part display left- and right-eye optotypes for a stereoscopic vision test. The control unit determines a lateral inter-optotype spacing between the left- and the right-eye optotypes based on the input pupillary distance so that a fusion optotype seen with the examinee's both eyes is perceived as an optotype that is seen floating or sinking by a fusion distance between a reference position and a predetermined fusion position, and makes the optotype presenting part display the left-eye optotype and the right-eye optotype based on the determined inter-optotype spacing.
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