FIELD: medicine.
SUBSTANCE: ophthalmic lens represents an optical area containing a central area having substantially a constant positive optical force, at least first ring area, which is concentric to the central area and possesses a positive long spherical aberration to prevent or delay progressive myopia. The lens comprises a second ring area with an optical force gradually decreasing to the lens periphery. A lens hypercorrection of the positive optical force of the central area can fall within the range from approximately 0.25 to approximately 1.00 dioptres.
EFFECT: possibility to prevent progressive myopia by means of multifocal lenses.
17 cl, 4 dwg
