The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 1979
Filed:
Mar. 09, 1978
Ikuzo Okamoto, Tamagawa, JP;
Osamu Shindo, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An objective eye examination apparatus generates rotating pencil rays of infrared light and focuses one of them on the eye pupil via an adjustable wedge reflector 55, 57 for varying the effective length of the optical axis. Light reflected back by the retina and returned into the optical system is passed through an image rotator 41 onto a quadrant photocell 43. The wedge reflector is adjusted until the differential outputs from the photocell reach a desired value, whereby the necessary reflector adjustment is indicative of refractive power. Unfocusable fogging light is also introduced into the eye via a dichroic mirror 39, and a further photocell 35 is disposed to receive light reflected back from the cornea only when the eye is properly positioned and open.