| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optometry apparatus with which a refraction of a test eye having a turbidity by a disease like cataract or the like can be measured objectively with an assured measurement precision by increasing a quantity of light of a visual target projected to the fundus of the eye. <P>SOLUTION: The optometry apparatus 1 includes a prism 23 which deflects a measurement beam projected to the fundus of the eye to measure the refraction of the test eye E objectively, an unit 2 constituted to include the prism 23 and a motor M1 which drives the unit 2 to rotate around an optical axis O'. The measurement beam deflected by the prism 23 is projected to the fundus of the eye of the test eye E with a prescribed distance from the optical axis O'. When the unit 2 is rotated by the motor M1, the projected image of the measurement beam has a circular orbit on the eyeground with the above prescribed distance as a radius. The circular orbit is considered as a circular visual target. The reflection beam from the visual target is detected by a CCD 19 to measure the refraction. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
