Patent ID: 6322213
Filing Date: 2001-11-27
Classification: G02C

Abstract:
A progressive multifocal contact lens (1) suitable for compensating presbyopia, characterized in that the power of the optical zone varies continuously with respect to the base dioptric power between the centre of the lens and the periphery of the optical zone according to a progression presenting:--a peak at the centre, from which there departs a first tract (a) that rapidly descends to the base dioptric power and along which the lens functions for near vision,--an intermediate second tract (b) substantially parallel to the abscissa at the value of the base dioptric power and along which the lens functions for far vision,--a peripheral third tract (c) consisting of a progressively rising first part (c') and of a second part (c"") parallel to the abscissa, said two parts (c', c"") corresponding to the powers at which the lens functions progressively for intermediate distances in the first part and in a constant manner for near vision in the second part.