Patent ID: 8292435

Claim:
An optometric apparatus for a subjective binocular visual performance test, the apparatus comprising right and left test units comprising: right and left housings; a plurality of optical elements disposed in each of the right and left housings; right and left test windows provided respectively to the right and left housings, in which desired optical elements selected from the optical elements are to be placed and through the selected optical elements, an optotype is presented to examinee's right and left eyes by an optotype presenting apparatus; right and left polarization plates having polarization axes perpendicular to each other, and arranged to be placed respectively in the right and left test windows; and right and left protective covers arranged to be placed respectively in the right and left test windows at a side facing the optotype presenting apparatus, and having polarization optical characteristics of changing circularly polarized light that passes through the right and left protective covers into linearly polarized light having polarization axes perpendicular to each other.