Konan Camera Research Institute Inc.

Matsushita Electric Works, Ltd.

Kazutaka Kani

Kuniomi Abe

Masahiko Konagaya

Noboru Ono

Satoru Inakagata

Shogo Fukushima

Shuji Murakami

Hideo Fukunaga

Akio Tabuchi

Fumiatsu Maeda

The perimeter comprises a display device, infrared light-emitting diodes, a CCD camera, a half mirror, an image processing device, a computer, and an operating switch. The computershows 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 the display device. The infrared light-emitting diodesirradiate infrared light to an eye of the subject. The CCD cameratakes an image of the eye of the subject using the infrared light irradiated from the infrared light-emitting diodes. The image processing devicedetects a pupil diameter of the subject based on the image taken by the CCD camera. The computermeasures a visual field of the subject based on the change of the pupil diameter of the subject detected by the image processing device. The feature of the present invention resides in that the display devicecomprises a display device capable of adjusting background luminance of a screen and brightness of the light stimulus eye-target separately.

Perimeter

An eye examining device having a television pickup camera, an optical system for magnifying the eye ground or retina and focussing the image on said camera, a television monitor connected to the camera to display the image of the retina and an optical pattern movably disposed in the plane of the image and a light source illuminating said pattern.

Eyeball examining device

An eye examining device having a television camera and monitor connected thereto, an optical system for magnifying the eye ground or retina and focussing the image on the camera, a cathode ray tube connected with the camera and scanned in synchronism therewith, a light pattern generator connected with the cathode ray tube and monitor for display thereof and an optical system for projecting the image on the cathode ray tube onto the eye ground.

Growing community of inventors

Kobe, Japan

Kazutaka Kani