Patent ID: 7874676
Filing Date: 2011-01-25
Classification: A61B

Abstract:
1. A subjective vision tester including: a pair of right and left lens chamber units each having a test window; first lens disks each provided with an aperture and optical elements and placed in a position closer to an examinee's eye within each lens chamber unit, the first lens disks including a sphere lens disk provided with an aperture and sphere lenses, and a cylinder lens disk provided with an aperture and cylinder lenses; second lens disks each provided with an aperture and optical elements and placed in a position farther from the examinee's eye than the first lens disks within each lens chamber unit, the second lens disks including a first auxiliary lens disk provided with an aperture and auxiliary lenses and a second auxiliary lens disk provided with an aperture and auxiliary lenses; wherein the first lens disks and the second lens disks are almost equal in diameter, each optical element in the first lens disks and each optical element in the second lens disks are almost equal in diameter, the diameter of each optical element and each aperture in the first lens disks is determined to provide a viewing angle of the examinee's eye of 40° or more when each of the optical elements and the apertures in the first lens disks is disposed in the test window, the diameter of each aperture in the second lens disks is determined to be larger than the diameter of each optical element in the first lens disks and provide the viewing angle of 40° or more when each aperture in the second lens disks is disposed in the test window, and the diameter of each optical element in the second lens disks is determined to be smaller than the diameter of each aperture in the second lens disks and provide a smaller viewing angle when each optical element in the second lens disks is disposed in the test window than when each aperture in the second lens disks is disposed in the test window.