US 12,259,596 B2
Ophthalmic lens having extended depth of field
Xin Wei, Hangzhou (CN)
Assigned to MDCO TECHNOLOGY LIMITED, Hangzhou (CN)
Filed by MDCO Technology Limited, Hangzhou (CN)
Filed on Jan. 4, 2022, as Appl. No. 17/568,332.
Claims priority of application No. 202110936281.1 (CN), filed on Aug. 16, 2021.
Prior Publication US 2023/0047990 A1, Feb. 16, 2023
Int. Cl. G02C 7/02 (2006.01)
CPC G02C 7/02 (2013.01) 11 Claims
OG exemplary drawing
 
1. An ophthalmic lens with an extended depth of field, comprising an optical unit including a first surface and a second surface that are both centered by an optical axis and are opposite to each other, wherein at least one of the first surface and the second surface is defined by a superposition of a base sag profile and a feature sag profile and comprises:
a first zone extending from the optical axis to a first radial boundary;
a second zone extending from the first radial boundary to a second radial boundary; and
a third zone extending from the second radial boundary to a circumference of the optical unit;
wherein the first zone is designed as a freeform surface zone, and the second zone is designed as a phase transition zone,
wherein the first zone comprises in sequence an inner region, a middle region and an outer region along a radial direction away from the optical axis, wherein in the feature sag profile corresponding to the first zone, a feature sag of the inner region is constant, a feature sag of the middle region increases as per a non-linear polynomial along a radial direction away from the inner region, and a feature sag of the outer region increases linearly.