Ophthalmological instrument with improved alignment mechanism

Details Ophthalmological instrument with improved alignment mechanism Ophthalmological instrument with improved alignment mechanism

1995-10-25

1997-10-28

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351221, A61B 314, A61B 310

Patent

active

056822243

ABSTRACT:
An alignment luminous flux is projected toward the cornea of an eye-to-be-detected by an alignment light projecting optical system. The alignment luminous flux reflected by the cornea is imaged on two light receiving means by an alignment light imaging optical system one of which light receiving means is disposed on the front side of an light collecting position adjacent to the cornea when the cornea is in a correct working distance and the other of which is on the back side.

REFERENCES:
patent: 4812033 (1989-03-01), Ishikawa
patent: 4944303 (1990-07-01), Katsuragi

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