US 12,279,821 B2
Refractive property measurement device, measurement tool, and refractive property measurement method
Takashi Iizuka, Tokyo (JP)
Assigned to HOYA LENS THAILAND LTD., Pathumthani (TH)
Appl. No. 17/312,835
Filed by HOYA LENS THAILAND LTD., Pathumthani (TH)
PCT Filed Dec. 11, 2019, PCT No. PCT/JP2019/048380
§ 371(c)(1), (2) Date Jun. 10, 2021,
PCT Pub. No. WO2020/137533, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-247322 (JP), filed on Dec. 28, 2018.
Prior Publication US 2022/0054005 A1, Feb. 24, 2022
Int. Cl. A61B 3/103 (2006.01); A61B 3/00 (2006.01)
CPC A61B 3/103 (2013.01) [A61B 3/0008 (2013.01); A61B 3/0025 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A refractive property measurement apparatus configured to measure refractive properties of an eye, the apparatus comprising:
a disk provided with a first aperture and a second aperture, the first aperture and the second aperture having a pinhole shape or a slit shape and being configured to transmit incident light rays while narrowing them;
a light emitting unit configured to emit a first light ray and a second light ray from different positions that are equally separated from the disk, on a plane parallel to a surface of the disk, so that the light rays having respectively passed through the first aperture and the second aperture enter the eye simultaneously; and
a processing unit configured to determine refractive properties of the eye from information of positions on a retina of the eye where the first light ray having passed through the first aperture and the second light ray having passed through the second aperture reach, wherein
the first aperture including a first optical element that has transmission characteristics of transmitting the first light ray but preventing the second light ray from passing therethrough,
the second aperture including a second optical element that has transmission characteristics of transmitting the second light ray but preventing the first light ray from passing therethrough,
the first light ray and the second light ray have different wavelength bands,
the first optical element is an optical filter in which a wavelength band is set so that the first light ray is transmitted but the second light ray is prevented from passing therethrough,
the second optical element is an optical filter in which a wavelength band is set so that the second light ray is transmitted but the first light ray is prevented from passing therethrough, and
the processing unit is configured to determine the refractive properties of the eye based on positions of images of the first light ray and the second light ray on a retina.