US 12,109,107 B2
Multifocal ophthalmic lens having chromatic aberration correction
Xin Hong, Fort Worth, TX (US); and Xin Wei, Frisco, TX (US)
Assigned to Alcon Inc., Fribourg (CH)
Filed by Alcon Inc., Fribourg (CH)
Filed on Apr. 13, 2021, as Appl. No. 17/229,252.
Application 17/229,252 is a continuation of application No. 16/536,567, filed on Aug. 9, 2019, granted, now 11,000,361.
Application 16/536,567 is a continuation of application No. 15/498,836, filed on Apr. 27, 2017, granted, now 10,420,638, issued on Sep. 24, 2019.
Prior Publication US 2021/0228335 A1, Jul. 29, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61F 2/16 (2006.01); G02C 7/04 (2006.01); G02C 7/06 (2006.01)
CPC A61F 2/1613 (2013.01) [A61F 2/1618 (2013.01); A61F 2/1637 (2013.01); A61F 2/1654 (2013.01); G02C 7/041 (2013.01); A61F 2/1659 (2013.01); A61F 2002/1681 (2013.01); G02C 7/06 (2013.01); G02C 2202/20 (2013.01); G02C 2202/22 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An ophthalmic lens, comprising:
an optic comprising a surface profile including a base curvature and a diffractive profile comprising a plurality of diffractive steps, at least a portion of the diffractive profile being a combination of:
a base diffractive profile defining multiple foci for the ophthalmic lens; and
an achromatizing structure that reduces longitudinal chromatic aberrations; and
the surface profile is defined as follows:

OG Complex Work Unit Math
wherein:
Sag(r) defines the surface profile of the ophthalmic lens excluding the achromatizing structure;
g(r) defines the achromatizing structure;
r3, r1′ and r2′ denote junction points on the surface profile;
Tg denotes a period in r2 space of the achromatizing structure;
└ ┘ denotes a floor function, wherein └x┘=max{m∈z|m≤x} is a set of integers; and
h denotes a step height.