Optical system for retinal camera

Details Optical system for retinal camera Optical system for retinal camera

1988-02-17

1989-06-13

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314

Patent

active

048386804

ABSTRACT:
An optical system for a retinal camera comprises objective lens adapted to be located toward a patient's eye. The retina of the patient's eye is illuminated and photographed through the objective lens, which has a first biconvex type lens means and a second biconvex type lens means with a space between them, the first biconvex type lens means has a curvature radius of the first convex surface open to the air and faces toward the eye of which is larger than that of the other second convex surfaces open to the air, and the second biconvex type lens means of which curvature radius of third convex surface open to the air and facing toward the first biconvex type lens means is larger than that of the other fourth convex surfaces open to the air.

REFERENCES:
patent: 4322137 (1982-03-01), Nohda

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