Patent ID: 6435681
Filing Date: 2002-08-20
Classification: A61F,G02C

Abstract:
An ophthalmic lens having a central optical axis and a baseline diopter power for far vision correction, the ophthalmic lens comprising:a near zone having a highest vision correction power and including an inner region having a substantially constant vision correction power greater than the baseline diopter power, and an outer region located outwardly of the inner region and having vision correction powers which are progressively reduced from the highest vision correction power of the near zone to a reduced near vision correction power which is about 50% to about 85% of the highest vision correction power of the near zone, the inner region has an innermost end at which the lens has the substantially constant vision correction power at a radial location closest to the central optical axis and the outer region has an outermost end, each of the inner region and the outer region having a radial width and the radial width of the inner region being in a range of about 30% to 65% of a radial distance between the innermost end of the inner region and the outermost end of the outer region.