Apparatus for measuring frontal power of contact lenses

Details Apparatus for measuring frontal power of contact lenses Apparatus for measuring frontal power of contact lenses

1974-06-28

1976-10-12

Corbin, John K.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

350245, 350247, G01B 900

Patent

active

039854450

ABSTRACT:
Apparatus for measuring the frontal power of corneal contact lenses made of a somewhat hydrophilic material and having a predetermined index of refraction in a liquid having itself a predetermined index of refraction. This apparatus comprises a sighting optical system and a measuring optical system spaced from each other and having a common optical axis extending substantially vertically at least in the gap between said two optical systems. It further comprises a small cup disposed in said gap and filled with said liquid, the cup bottom comprising a fluid-tight window centered to said optical axis and means for supporting a contact lens in said liquid in a position centered to said optical axis.

REFERENCES:
patent: 3779648 (1973-12-01), Poster
patent: 3820899 (1974-06-01), McCormack
patent: 3822096 (1974-07-01), Wilms et al.
patent: 3839684 (1974-10-01), Matsusha

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