RASTER DIFFRACTION-APERTURE MASK TO CORRECT DEFECTIVE EYE SIGHT Russian patent published in 1999 - IPC

FIELD: optical instrumentation, medical equipment, eye optics. SUBSTANCE: raster diffraction-aperture mask is made of opaque mask with set of transparent regions and elements that are anchored in front of eyes. Transparent regions are fabricated in the form of ovals which dimensions in chosen direction are related to refraction of eye in this meridian, length of oval changes from 2.6 ,, to 0.1 mm. Array of transparent regions is manufactured in the form of hexagonal raster with spacing of 1.0-6.0 mm that is determined by diameter of pupil of user. Technical result of usage of proposed raster diffraction-aperture mask consists in selection of optimal form, dimensions and arrangement of transparent regions in mask depending on characteristics of eyes of user which provides for possibility of correction of defective eye sight, for improved color perception and for improved visual evaluation of distances between objects. EFFECT: improved efficiency of proposed diffraction- aperture mask for correction of defective eye sight. 3 cl, 5 dwg, 1 tbl