Objectives refraction measuring apparatus
AssigneeTopcon Corporation
InventorsSaeko Uchida, Yasuo Kato, Kunihiko Hara
Life of this patent
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Abstract
An objective refraction measurement apparatus includes a separate chart having a pair of charts arranged separately, an optical system for projecting the separate chart to an eye to be examined through a focusing lens and a diaphragm having a pair of through holes arranged corresponding to the separate arrangement of the pair of charts, an operating unit for performing focusing operation to the eye, and a control unit for moving the focusing lens on the basis of the focusing operation along the optical axis direction by the operating unit to obtain the projection images of the pair of charts in the separate chart to the eye in an identical condition or a non-identical condition, thereby to perform a subjective measurement of the eye.
Claims5
An objective refraction measuring apparatus for measuring a refractive power of an eye to be examined in an objective manner, comprising:
- a separate chart having a pair of charts arranged separately;
- an optical system for projecting the separate chart to the eye through a focusing lens and a diaphragm having a pair of holes arranged corresponding the pair of charts;
- moving means for moving the focusing lens along an optical axis direction to perform a focusing operation to the eye;
- and
- means for measuring the eye in a subjective manner while the projection images of the pair of charts to the eye are obtained in an identical condition or a non-identical condition by moving the focusing lens by the moving means.
Dependencies are inferred from the claim text.