Toric Ophthalimc Lenses Having Selected Spherical Aberration Characteristics
A toric ophthalmic lens having substantially zero spherical aberration for a first circular aperture having a first diameter and substantially zero spherical aberration for a second circular aperture having a second diameter, the first diameter being at least 4 mm and the second diameter being at least 3 mm, the first diameter being at least 0.5 mm larger than the second diameter. A series of ophthalmic lenses, each lens comprising a same spherical power as the other lenses in the set, and a unique cylindrical power, each lens comprising (i) a first toric surface, and (ii) a second surface, at least one of the first surface and the second surface being aspheric in a meridian, the lens having substantially zero spherical aberration for all circular optical zone diameters less than 4 mm.
1 . A toric ophthalmic lens having substantially zero spherical aberration for a first circular aperture having a first diameter and substantially zero spherical aberration for a second circular aperture having a second diameter, the first diameter being at least 4 mm and the second diameter being at least 3 mm, the first diameter being at least 0.5 mm larger than the second diameter.
2 . The lens of claim 1 , wherein the substantially zero spherical aberration for the first aperture and the second aperture is achieved for 546 nm light.
3 . The lens of claim 1 , wherein the first diameter is at least 4.5 mm and the second diameter being at least 3.5 mm,
4 . The lens of claim 1 , wherein the first aperture and the second aperture both have spherical aberration magnitudes that are less than 1/10 of wave.
5 . The lens of claim 1 , wherein the lens has a posterior optical zone and an anterior optical zone, at least one of the posterior optical zone and the anterior optical zone being toric, the toric optical zone being biaspheric.
6 . The lens of claim 1 , wherein the lens has a posterior optical zone and an anterior optical zone, at least one of the posterior optical zone and the anterior optical zone being toric, at least one meridian of the toric optical zone comprises even-powered aspheric terms.
7 . The lens of claim 6 , wherein at least one meridian of the toric optical zone comprises only even-powered aspheric terms.
8 . The lens of claim 1 , wherein the lens is an intraocular lens.
9 . The lens of claim 1 , wherein the lens is a contact lens.
10 . An ophthalmic lens, comprising:
a first toric surface; and
a second surface, at least one of the first surface and the second surface being aspheric in a meridian, the lens having substantially zero spherical aberration for all circular optical zone diameters less than 4 mm.
11 . The lens of claim 10 , wherein the substantially zero spherical aberration is achieved for 546 nm light.
12 . The lens of claim 10 , wherein the lens has substantially zero spherical aberration for all circular optical zone diameters less than 4.5 mm.
13 . The lens of claim 10 , wherein the lens has substantially zero spherical aberration for all circular optical zone diameters less than 5.0 mm.
14 . The lens of claim 10 , wherein the spherical aberration has a magnitude of less than 1/20 of wave for all circular optical zone diameters less than 4 mm.
15 . The lens of claim 10 , wherein the meridian is a meridian of a toric surface.
16 . The lens of claim 10 , wherein the meridian is a meridian of a circularly symmetric surface.
17 . The lens of claim 10 , wherein the toric surface is biaspheric.
18 . The lens of claim 10 , wherein at least one meridian of the toric surface comprises even-powered aspheric terms.
19 . The lens of claim 18 , wherein the toric surface comprises only even-powered aspheric terms.
20 . The lens of claim 10 , wherein at least one meridian of the toric surface comprises only odd-powered aspheric terms.
21 . The lens of claim 10 , wherein the lens is an intraocular lens.
22 . The lens of claim 10 , wherein the lens is a contact lens.
23 . A series of ophthalmic lenses, each lens comprising a same spherical power as the other lenses in the series, and a unique cylindrical power, each lens comprising (i) a first toric surface, and (ii) a second surface, at least one of the first surface and the second surface being aspheric in a meridian, the lens having substantially zero spherical aberration for all circular optical zone diameters less than 4 mm.