US Patent 7874676 Vision tester

A subjective vision tester includes a pair of right and left lens chamber units (2) each having a test window (4), a first lens disk (11-14) provided with an aperture and a plurality of optical elements (110, 120, 130, 140) and placed in a position closer to an examinee's eye (E) within the each lens chamber unit, and a second lens disk (15, 16) provided with an aperture (151, 161) and a plurality of optical elements (150, 160) and placed in a position farther from the examinee's eye than the first lens disk within the lens chamber unit. The first lens disk and the second lens disk are equal in diameter. The diameter of the diameter of the aperture in the second lens disk is larger than each optical element in the first lens disk.