Ophthalmic measurement apparatus

Details Ophthalmic measurement apparatus Ophthalmic measurement apparatus

1992-03-05

1994-10-11

Shafer, Ricky D.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, A61B 310

Patent

active

053551869

ABSTRACT:
An ophthalmic measurement apparatus comprises a laser beam projection section for projecting into an eye a linearly polarized laser light beam emitted by a laser source, and a light receiving section provided with a photosensor for detecting laser light scattering from within the eye. An angle of the optical axes formed by both the sections with respect to the eye is set to be substantially ninety degrees. The polarization direction of the laser beam from the laser beam projection section is made variable in such a way that, during alignment, the polarization direction is set substantially perpendicular to a plane that includes the optical axes of both the sections, and during measurement it is set in a direction that is substantially in the plane. This arrangement makes it possible to cut noise components caused by light scattered by flares which are much smaller than the wavelength of the light.

REFERENCES:
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patent: 4541697 (1985-09-01), Remijan
patent: 4877321 (1989-10-01), Ichihashi et al.
patent: 4917486 (1990-04-01), Raven et al.
patent: 4988184 (1991-01-01), Akiyama
patent: 4991954 (1991-02-01), Akiyama
patent: 5000562 (1991-03-01), Ichihashi et al.

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