US 12,245,814 B2
Refraction measuring apparatus
Takashi Iizuka, Tokyo (JP)
Assigned to HOYA LENS THAILAND LTD., Pathumthani (TH)
Filed by HOYA LENS THAILAND LTD., Pathumthani (TH)
Filed on Sep. 27, 2021, as Appl. No. 17/485,873.
Claims priority of application No. 2020-161774 (JP), filed on Sep. 28, 2020.
Prior Publication US 2022/0095915 A1, Mar. 31, 2022
Int. Cl. A61B 3/00 (2006.01); A61B 3/15 (2006.01); G01N 21/41 (2006.01)
CPC A61B 3/152 (2013.01) [A61B 3/0008 (2013.01); G01N 21/4133 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A refraction measuring apparatus that measures refractive properties of an eye based on respective images formed by first and second light bundles, emanating from a light emitter, the first and second light bundles respectively passing through first and second apertures, provided at a same distance away from the light emitter, and concurrently incident on the eye, the refraction measuring apparatus comprising, at respective positions corresponding to a pair of the eyes:
a first rotational member, rotatably supported on a support member about a first rotational center, provided with the first aperture and the second aperture on either side of the first rotational center;
a second rotational member, rotatably supported about a second rotational center, at a different position from the first rotational center, the second rotational member provided with at least one light-transmission portion and a light-shielding portion at different positions in a rotational direction about the second rotational center,
wherein when the first rotational member is rotated relative to the support member, the second rotational member rotates in association with the rotation of the first rotational member, and
wherein, while an aperture arrangement direction of the first and second apertures changes in accordance with the rotation of the second rotational member, the refraction measuring apparatus enters one of:
a light-transmission state in which the light-transmission portion coincides with the first and second apertures to allow the first and second light bundles to pass through the first and second apertures; and
a light-shielding state in which the light-shielding portion coincides with the first and second apertures to shield the first and second light bundles.