Conventional diopsimeters do not calculate the ratio of a visual field defect area to a macular area.  With the conventional diopsimeters, it is impossible to numerically understand the degree of the visual field defect with respect to the macular area of a subject. A macular area visual field defect index calculation device comprises a visual field search screen creation means, a fixation target display control means, a search area setting means, a search point setting means, a visual target display control means, a first counting means, a second detection means, a second counting means, and a visual field defect index calculation means for dividing the number of times counted by the second counting means and stored in a storage device by the total number counted by the first counting means and stored in the storage device.  Since a search area is set so as to be limited mainly to a macular area, the macular area visual field defect index calculation device can calculate the ratio of a visual field defect area to the macular area as an indicator and makes it possible to numerically understand the degree of the visual field defect with respect to the macular area.
MACULAR AREA VISUAL FIELD DEFECT INDEX CALCULATION DEVICE