Patent ID: 8696746
Filing Date: 2014-04-15
Classification: A61F,G02C

Abstract:
1. An ophthalmic lens comprising a main lens part having a surface, a recessed part having a surface which is recessed with respect to said surface of said main lens part, an optical centre, and an optical axis through said optical centre, said main lens part having at least one boundary with said recessed part, said main lens part having an optical power of between about −20 to about +35 dioptre, said recessed part positioned at a distance of less than 2 mm from said optical centre and comprising a near part having a relative dioptre of about +1.0 to about +5.0 with respect to the optical power of said main lens part, said at least one boundary of said main lens part with said recessed lens part form a blending part or blending parts, which said blending parts are shaped to refract light away from said optical axis and have a curvature resulting in a loss of light, within a circle with a diameter of 4 mm around said optical centre, of less than about 15%, said loss of light defined as the fraction of the amount of in-focus light from the ophthalmic lens compared to the amount of in-focus light from an identical ophthalmic lens without said recessed part, wherein said recessed part is at two sides bounded by blending parts running through said optical centre, the recessed part thus being shaped as a meridian zone, said blending parts at said two sides being within semi-meridians enclosing an angle larger than 1 degree and less than 17 degrees, a shape of said blending parts having an S-shaped curve having a steepest part with a slope or first derivative that is dependent on a radial distance from the optical centre, the slope at a radial distance of 1.6 mm from the optical centre having a steepness of more than 0.1.