Patent ID: 7478911
Filing Date: 2009-01-20
Classification: A61B

Abstract:
1. A perimeter comprising: a display means; an eye-target control means which shows a fixed eye-target for fixing a line of sight of a subject and a light stimulus eye-target for giving a light stimulus to a pupil of the subject at a plurality of predetermined positions on said display means; an infrared light irradiating means for irradiating infrared light to an eye of the subject; an imaging means for taking an image of the eye of the subject using the infrared light irradiated from said infrared light irradiating means; a case for housing said display means, said infrared light irradiating means, and said imaging means therein, said case having a peephole through which the subject looks at said fixed eye-target and said light stimulus eye-target displayed on said display means from outside; a pupil detection means for detecting a pupil diameter of the subject based on the image taken by said imaging means; a visual field measuring means for measuring a visual field of the subject based on a change of the pupil diameter of the subject detected by said pupil detection means when said eye-target control means shows the light stimulus eye-target in a condition where the subject looks at the fixed eye-target, wherein said display means comprises a display device capable of adjusting background luminance of a screen and brightness of the light stimulus eye-target separately.