Ophthalmic instrument

Details Ophthalmic instrument Ophthalmic instrument

1998-10-08

1999-11-02

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 314

Patent

active

059756985

ABSTRACT:
Disclosed herein is an ophthalmic instrument comprising: an optical measuring section (101) for housing an optical system that measures characteristics of an object eye; an alignment detecting optical system (17') for optically detecting an offset quantity in alignment between the optical measuring section and the object eye; drive units (102 and 103) for moving the optical measuring section (101) vertically, laterally, and longitudinally on the basis of the offset quantity detected by the alignment detecting system (17'); and a control circuit (51) for transmitting a signal which instructs start of measurement to the optical measuring section (101) when the alignment detecting system detects that the object eye has been moved within a measurable area. Prior to the start of measurement the control circuit (51) continues to move the optical measuring section (101) for only a predetermined time so that the object eye (optical axis Oe of the object eye) is moved within a drive target area smaller than the measurable area and also included in the measurable area.

REFERENCES:
patent: 5644375 (1997-07-01), Suzuki
patent: 5905562 (1999-05-01), Isogai et al.

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