Abstract: An improved keratometer instrument capable of measuring keratometric values of an eye is provided. An optical reference of a predetermined dimensional value is directed at the cornea of the eye and an optical sensor measures the same at different meridians. A computer circuit can determine whether the instrument is de-centered or de-focused relative to the eye and can derive measurements of keratometric values. The axis of astigmatism can be visually displayed to the surgeon during an operation.
Type:
Grant
Filed:
April 1, 1983
Date of Patent:
July 1, 1986
Assignee:
Keratometer Research and Development
Inventors:
Steven E. Feldon, Barry G. Broome, David A. Wallace