Aspheric lenses
First Claim
1. A monofocal ophthalmic lens having an extended depth of field, comprisinga lens optic providing a nominal diopter power and further characterized by at least one refractive surface having a base curvature, and a pattern of surface deviations superimposed on said base curvature so as to modulate the topography of said refractive surface in a range of about −
- 0.5 microns to about 0.5 microns so as to enhance a depth of field of said lens by at least about 40% relative to a lens having said lens optic and said refractive surface without said surface deviations.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides monofocal ophthalmic lenses that exhibit extended depth of field while providing sufficient contrast for resolution of an image over a selected range of defocus distances. In some embodiments, a lens of the invention can include a refractive surface having controlled surface modulations relative to a base profile. The surface modulations are designed to extend a depth of field of the lens such that a single image can be resolved, albeit with somewhat less contrast, over a range of distances greater than the focal region of a conventional lens. The ophthalmic lenses of the invention can be employed in various vision correction applications, including, but not limited to, intraocular lenses, contact lenses, instrastromal implants and other refractive devices.
127 Citations
18 Claims
-
1. A monofocal ophthalmic lens having an extended depth of field, comprising
a lens optic providing a nominal diopter power and further characterized by at least one refractive surface having a base curvature, and a pattern of surface deviations superimposed on said base curvature so as to modulate the topography of said refractive surface in a range of about − - 0.5 microns to about 0.5 microns so as to enhance a depth of field of said lens by at least about 40% relative to a lens having said lens optic and said refractive surface without said surface deviations.
- View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15, 16)
-
7. A monofocal ophthalmic lens for vision correction having an extended depth of field, comprising
a lens optic comprising a refractive surface having a base profile modulated by a pattern of surface deviations in accordance with the relation: -
Z(r)=A(r)cos(B(r)r2)wherein Z(r) denotes a surface deviation at a radial distance r from an optical axis of said lens, and A(r) and B(r) are functions of radial distance r selected so as to enhance a depth of field of said lens by at least 50% relative to a lens having said lens body and said refractive surface without said surface deviations. - View Dependent Claims (8, 9, 10, 11, 12)
to about 2π
.
-
-
11. The monofocal lens of claim 7, wherein A is selected to have a maximum value in a range of about
to about microns, wherein n2 denotes an index of refraction of said lens body and n1 denotes an index of refraction of an environment in which the lens is disposed. -
12. The monofocal lens of claim 8, wherein A(r) and B(r) are defined as polynomials in accordance with the relations:
-
A(r)=a0+a1r+a2r2+ . . . +anrn
B(r)=b0+b1r+b2r2+ . . . +bnrnwherein n is selected to be less than about 20, and parameters a0-an and b0-bn are selected so as to provide said enhanced depth of field.
-
-
17. A method for generating an intraocular lens for vision correction having an extended depth of field, comprising
selecting a circularly symmetric base profile for at least a refractive surface of said lens, defining a circularly symmetric continuously varying pattern of surface deviations from said base profile, and applying said pattern of surface deviations to said base profile to define a continuously varying topography for said refractive surface, wherein said pattern of surface deviations is defined so as to enhance a depth of field of said lens by at least about 50% relative to a lens having a refractive lens with said base profile without said surface deviations.
Specification