Refraction measuring apparatus
Number of patents in Portfolio can not be more than 2000
United States of America
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Mar 11, 2025
Grant Date -
Mar 31, 2022
app pub date -
Sep 27, 2021
filing date -
Sep 27, 2021
priority date (Note) -
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status (Latency Note)
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Abstract
A refraction measuring apparatus measures refractive properties of an eye by two light bundles respectively passing through two apertures, the apparatus including: a first rotational member, rotatably supported about a first rotational center, provided with the two apertures on either side of the first rotational center; a second rotational member, rotatably supported about a second rotational center, provided with a light-transmission portion(s) and a light-shielding portion at different rotational-direction positions. When the first rotational member is rotated, the second rotational member rotates, and while an aperture arrangement direction of the two apertures changes in accordance with the rotation of the second rotational member, a light-transmission state is entered, in which the light-transmission portion coincides with the two apertures to allow the two light bundles to pass through, or a light-shielding state is entered, in which the light-shielding portion coincides with the two apertures to shield the two light bundles.
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