Ophthalmic apparatus

Details Ophthalmic apparatus Ophthalmic apparatus

1996-11-25

1998-06-09

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 310

Patent

active

057643415

ABSTRACT:
An ophthalmic apparatus in which a measuring part for inspecting-or-measuring an eye to be examined is disposed so as to move relatively against a fixation stand, the ophthalmic apparatus comprises light source for use in detecting a relative movement, which is disposed in the one between the fixation stand side and the measuring part side, photo detecting elements for detecting a light bundle emitted from the light source for use in detecting a relative movement, which is disposed in the other between the fixation stand side and the measuring part side, target forming device for forming at least two target-images, that are transmitted from the light source for use in detecting a relative movement onto the photo detecting elements plane, upon before and after the movement according to the relative movement by the measuring device against the fixation stand, and calculating device for calculating a relative position of the measuring part against the fixation stand based on a detecting information of the target images detected by the photo detecting elements.

REFERENCES:
patent: 5406076 (1995-04-01), Mimura et al.
patent: 5502519 (1996-03-01), Hosoi
patent: 5532769 (1996-07-01), Miwa et al.

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