Variable circular dual image corneal radius measurement instrume

Details Variable circular dual image corneal radius measurement instrume Variable circular dual image corneal radius measurement instrume

1981-08-13

1984-03-27

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351247, A61B 310, A61B 300

Patent

active

044390254

ABSTRACT:
An instrument (20) for measuring the radius of curvature of a cornea (58) of an eye (60) is provided. The instrument (20) includes structure (90, 98, 180) for projecting a reference image (70) onto the cornea (58). The reference image (70) comprises substantially a circle of discontinuous dots (82). A rod (80) of refractile transparent material is provided for optically forming two images (70a, 70b) substantially identical to the reference image (70). Structure (90, 98) is further provided for varying the diameter of the reference image (70) and the two images (70a, 70b) substantially identical to the reference image (70), such that the images form a predetermined image pattern. Structure (36, 38) is provided for measuring the diameter of the reference image (70) when the predetermined image pattern is formed to provide an indication of the radius of curvature of the cornea (58).

REFERENCES:
patent: 4046463 (1977-09-01), La Russa et al.
patent: 4157859 (1979-06-01), Terry
patent: 4165744 (1979-08-01), Cravy et al.

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