| 摘要 |
<P>PROBLEM TO BE SOLVED: To minutely specify a lesion section while utilizing an advantage of a visual field test where Frequency doubling illusion is applied. <P>SOLUTION: A visual field testing apparatus is provided with an optotype presentation means for presenting a check optotype of a prescribed size for testing a visual field failure by applying Frequency doubling illusion. The apparatus divides a prescribed visual field range into a plurality of divisions by a prescribed size of the optotype, presents the optotype by changing a division of presenting the optotype of the prescribed size one by one and changing the contrast of the optotype. Based on the viewing response of a subject in the case, the apparatus obtains a sensitivity threshold of the contrast to test the visual field failure of the eye to be tested. The apparatus is provided with a control means which deviates and presents the optotype of the prescribed size so as to contain a part of the division when there exists a division where the sensitivity threshold obtained in the divided division is smaller than a prescribed reference value, and which obtains the sensitivity threshold based on the viewing response of the subject in the case of changing and presenting the contrast of the optotype at a presenting position. <P>COPYRIGHT: (C)2007,JPO&INPIT |
