Working distance alignment optical system for ophthalmological i

Details Working distance alignment optical system for ophthalmological i Working distance alignment optical system for ophthalmological i

1987-09-22

1989-05-30

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 314

Patent

active

048345270

ABSTRACT:
A working distance alignment optical system for use in an ophthalmological instrument includes a target projecting optical system for projecting a target to a cornea of an eye to be tested, and a target image observing optical system for observing an image of the target in the cornea from the diagonal direction with respect to the target projecting optical system. The working distance alignment optical system is characterized in that at least one of the target projecting optical system and the target image observing optical system is provided with an optical element whose optical working surface is a toric surface.

REFERENCES:
patent: 4180323 (1979-12-01), Persson et al.

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