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:
Jan. 26, 1982
Filed:
Feb. 06, 1979
Karl-Heinz Wilms, Emmering, DE;
Optische Werke G. Rodenstock, Munich, DE;
Abstract
A phototopometer for determining the curvature of the cornea of an eye including pairs of measuring targets arranged in a measuring target carrier for disposition at a predetermined distance from the cornea of the eye to be measured and a photographing system for photographing the measuring targets reflected on the cornea to enable the radius of curvature of the cornea in the zone of the measuring target reflection to be determined from the reproduced image of the measuring targets in accordance with geometrical characteristics the photographing system has an optical axis and the spacing of the measuring targets of each measuring target pair is dimensioned in dependence on the distance thereof to the optical axis of the photographing system and to the cornea, whereby in accordance with the reproduction scale of the photographing system, the spacings of all reproduced measuring target pairs are in the same proportional relationship to the respectively associated radius of the cornea.