Patent ID: 7537343

Claim:
An optotype presenting apparatus for testing a visual function of an eye of an examinee, the apparatus comprising: display means including a memory in which a plurality of optotypes are stored and a display on which at least one of the stored optotypes is displayed; the display means being placed at a distance for far vision test from the examinee's eye; operation means from which an optotype switching signal is output; and display control means being capable of switching the optotype on the display so immediately that the examinee cannot identify the switching of the optotype if the examinee can barely read the optotype, wherein the display control means controls the display to cause the optotype to disappear once for a duration of time needed for the examinee to readily identify the switching of the optotype without immediately switching the optotype in response to the switching signal of one of an optotype for making the examinee indicate an orientation thereof and an optotype for making the examinee read a letter thereof, and the duration of time for disappearing the optotype is 0.05 second to 1.0 second.