Keratometer having photographically produced bore pattern

Details Keratometer having photographically produced bore pattern Keratometer having photographically produced bore pattern

A - Human Necessities

61

B

A61B 3/107 (2006.01)

Patent

CA 2173344

An improved conical keratometer (10) 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 (40) retained within the keratometer bore (12). Opposite edges (51, 52) of the slide (40) are chamfered at equal but opposite angles so that, when the spindeled slide is released) the chamfered edges (51, 52) will meet along a line of contact rather than butting squarely together. The film slide (40) is rolled so that the emulsion side (53) is toward the periphery of the cone bore (12) and the chamfering allows that side to lie smoothly against the cone bore (12) without any gaps so that an undistorted image may reliably be reflected upon a standard target.

Kératomètre conique amélioré (10), dans lequel l'image source du motif devant être réfléchi sur une cible positionnée à proximité du trou central éclairé est enregistrée sur une diapositive (40) retenue à l'intérieur du trou (12) du kératomètre. Des bords opposés (51, 52) de la diapositive (40) sont biseautés selon des angles égaux mais opposés, de sorte que, lorsque la diapositive enroulée est libérée, les bords biseautés (51, 52) se rejoignent le long d'une ligne de contact plutôt que de venir en butée directe l'un contre l'autre. La diapositive (40) est enroulée de sorte que le côté émulsionné (53) soit orienté vers le pourtour du trou (12) du cône, le biseautage permettant audit côté de venir en appui de façon régulière contre le trou (12), sans espaces intermédiaires, une image sans déformation pouvant ainsi être réfléchie avec une grande fiabilité sur une cible standard.

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