| 摘要 |
PROBLEM TO BE SOLVED: To provide an ophthalmologic instrument that can accurately detect the position to be examined with a simple structure even when eye motion is fast, and also carry out ophthalmic measurement of plural longitude lines with a high accuracy. SOLUTION: A reflected image Ec" from a cornea is formed on a two-dimensional sensor array 4. At this time, the image Ec" immediately blurs if its distance from the cornea Ec is not proper, or does not give a sharp image unless the working distance accurately agrees. Three radial eye-refracted values are obtained from positional coordinates of 6 light beams A-F as images reflected from the fundus of the eye, on the two-dimensional sensor array. If an image Ec" with luminous intensity above a fixed value is obtained, measurement when proper positioning is made is conducted by detecting and measuring the light beams A-F at this moment. |
