Visual function testing method and control device

The present invention relates to a visual function testing method and a visual function testing control device. The visual function testing device includes: a visual target image presentation unit that presents a visual target image; a visual target image rendering unit that renders the visual target image to be presented on the visual target image presentation unit; a visual function test item selection unit that selects a visual function test item; a visual target image generation unit that generates a visual target image corresponding to the test item selected by the visual function test item selection unit; a viewpoint distance input unit that inputs a distance between the visual target image presentation unit and a viewpoint of an observer; and a visual angle input unit that inputs an angle to be made by the visual target image and the viewpoint of the observer. Based on a viewpoint distance inputted by the viewpoint distance input unit and on a visual angle inputted by the visual angle input unit, the visual target image rendering unit calculates a display size and display position of a visual target image corresponding to a visual acuity or visual field test selected by the visual function test item selection unit, and renders the visual target image with the calculated display size at the calculated display position.