Refractive property measurement device, measurement tool, and refractive property measurement method

A measurement tool configured to be disposed between positions for emitting a first light ray and a second light ray, and an eye, in measuring refractive properties of the eye that receives the first light ray and the second light ray from forward, the tool 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 the first light ray and the second light ray entering thereto while narrowing them and to make the transmitted first light ray and second light ray reach a retina of the eye;
• and
• a support that fixes the disk in front of the eye,
• wherein, in order to enable distinguishing between positions on the 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,
• 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 therethourgh, and
• 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 therethourgh.

A refractive property measurement method for measuring refractive properties of an eye, the method comprising:

• emitting a first light ray and a second light ray from different positions that are equally separated from a disk, on a plane parallel to a surface of the disk, so that incident light rays entering the disk enter the eye simultaneously by passing through a first aperture and a second aperture provided to the disk, the first aperture and the second aperture having a pinhole shape or a slit shape and being configured to transmit the incident light rays while narrowing them;
• and
• determining the 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 therethourgh,
• 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 therethourgh.