PRESBYOPIA CORRECTION LENSES AND METHODS OF DESIGNING LENSES Russian patent published in 2015 - IPC G02C7/04 

FIELD: physics, optics.

SUBSTANCE: set of contact lenses comprises three groups of lenses. Each group consists of composite lenses which provide a spherical power in the range of -12.00 to +8.00 dioptres with an increment of 0.50 dioptres and an additional optical power in the range of about 0.75 to 2.50 dioptres with an increment of 0.25 dioptres. Lenses of the first, second and third groups have, respectively, average monocular weighted distance coefficients d_A, d_B and d_C and average monocular weighted closeness coefficients n_A, n_B and n_C. Each of the lenses of the first, second and third groups have an optical power profile different from that of a lens from another group, wherein d_A>d_B>d_C and n_A<n_B<n_C.

EFFECT: improved presbyopia correction and shorter production time owing to use concurrent lens pairs, which provide good binocularity and sharpness of vision at short, medium and long distances.

10 cl, 4 dwg, 2 tbl