Illumination apparatus for ophthalmic refractors

Details Illumination apparatus for ophthalmic refractors Illumination apparatus for ophthalmic refractors

1992-07-01

1994-01-25

Ben, Loha

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351229, 351234, A61B 310

Patent

active

052819841

ABSTRACT:
An illuminator assembly is provided for ophthalmic refractors which is formed as a singular light guide formed in unitary fashion of a transparent polymeric material. The light guide includes a light input portion located adjacent an incandescent light source mounted within the refractor housing. The light guide has transparent output portions which extend uniformly and continuously about the axis scale and further extend to the cylinder power window and the spherical power window. Through the use of a potentiometer/voltage regulator based circuit, the practitioner may alter the intensity of the light propagated to these readout functions by maneuvering a knob mounted upon the battery housing. To improve the characteristics of the illumination, the transparent outputs of the light guide are formed as Fresnel lenses.

REFERENCES:
patent: 4523822 (1985-06-01), Thurston
patent: 4606624 (1986-08-01), Wood
patent: 4798457 (1989-01-01), Morohashi et al.
patent: 4820040 (1989-04-01), Sims
patent: 4943162 (1990-07-01), Sims
patent: 5223864 (1993-06-01), Twisselmann

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