LENSES WITH GRADUAL INCREASE OF OPTICAL POWER, APPROPRIATE FOR CLIENT REQUIREMENTS Russian patent published in 2006 - IPC G02C7/00 

FIELD: ophthalmology, in particular, engineering of multi-focal ophthalmologic lenses, which can be used in cases, when large area of intermediate refraction power is required.

SUBSTANCE: lens is formed having at least one surface with gradual increase of optical power, while aforementioned surface is split onto series of continuous small zones, each one of which is shaped like surface, given by curved surface equation, determined for each of aforementioned zones, while aforementioned lens is lens with gradual increase of optical power, containing at least one surface, having far vision zone, close vision zone and channel. Gradient of optical power of channel is about 0,12 diopter/mm or less, channel length is about 19 mm or less, width of far vision zone is approximately equal to or more than channel width, channel width approximately equals or exceeds close vision zone, and maximal undesirable astigmatism of lens is less than approximately 80% of added diopter power.

EFFECT: in accordance to invention, inclusion of larger refraction zone requires neither partial nor full exclusion of distance vision zone.

2 cl, 9 dwg