Retinoscope with external control sleeve

Details Retinoscope with external control sleeve Retinoscope with external control sleeve

A - Human Necessities

61

B

A61B 3/103 (2006.01) A61B 3/12 (2006.01)

Patent

CA 2077986

A streak retinoscope has an external control sleeve (14) that is fully rotatable and is movable axially for rotating the lamp (22) and focusing the lens assembly (25), respectively. The lens assembly is carried on a lens holder sleeve (26) and the lamp assembly is carried on a lamp carrier (21). The lamp carrier is rotatable but is held against axial motion, while the lens holder sleeve is held against rotation but is moveable axially. A sliding gear arrangement (36, 37, 38, 39) is formed wherein the lamp carrier sleeve (21) is configured with axially elongated teeth (38), thus serving as a sun gear. The outer control sleeve (14) has internal teeth (38) and serves as the ring gear. Planet gears (36) can be carried on the lens carrier sleeve (26).

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