Optics: eye examining – vision testing and correcting – Eye examining or testing instrument
Patent
1994-03-07
1995-05-02
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
351221, 351246, A61B 300
Patent
active
054124417
ABSTRACT:
An improved conical keratometer wherein the parent image of the pattern to be reflected upon a target positioned adjacent to the illuminated bore is recorded on a film slide retained within the keratometer bore. Opposite edges of the slide are chamfered at equal but opposite angles so that, when the spindeled slide is released, the chamfered edges will meet along a line of contact rather than butting squarely together. The film slide is rolled so that the emulsion side is toward the periphery of the cone bore and the chamfering allows that side to lie smoothly against the cone bore without any gaps so that an undistorted image may reliably be reflected upon a standard target.
REFERENCES:
patent: 3181351 (1965-05-01), Stauffer
patent: 3639043 (1972-02-01), Townsley
patent: 4426141 (1984-01-01), Holcomb
patent: 4772115 (1988-09-01), Gersten et al.
patent: 4863260 (1989-09-01), Gersten et al.
patent: 5018850 (1991-05-01), Gersten et al.
Maus Roy
Tibbling Lars
Mai Huy
Popper Howard R.
Sikes William L.
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