Ophthalmic lenses with reduced chromatic blur
View Patent ↗The present invention provides single vision and multifocal lenses, as well as methods for their production, having a transverse chromatic aberration enabling provision of a lens the performance of which is equivalent to a refractive lens with a higher Abbe number.
1. An ophthalmic lens, comprising a spherical power Φ, a diffractive element comprising a first spherical power Φ D and a refractive element comprising a second spherical power Φ R , wherein the diffractive element comprises a material having an Abbe number of about 30 to about 60, wherein:
Φ
R
V
R
+
Φ
D
V
D
=
0
and wherein V R is the Abbe number of the refractive element of the lens and V D is an effective Abbe number of the diffractive element of the lens.
2. The lens of claim 1 , wherein the diffractive element comprises a diffractive power of:
2
Φ
1
-
V
R
V
D
>
Φ
D
>
0.
3. The lens of claim 1 , wherein the diffractive element comprises a diffractive power of:
1.5
Φ
1
-
V
R
V
D
>
Φ
D
>
.5
Φ
D
.
4. The lens of claim 1 , wherein the diffractive element comprises a diffractive power of:
[
V
D
·
(
-
TCA
0.1
·
y
·
V
R
-
Φ
)
V
R
-
V
D
]
>
Φ
D
>
V
D
·
(
TCA
0.1
·
y
·
V
R
-
Φ
)
V
R
-
V
D
.
5. The lens of claim 1 , 2 , 3 or 4 , wherein the diffractive element comprises substantially the entire back surface of the lens.
6. The lens of claim 1 , 2 , 3 or 4 , wherein the diffractive element comprises substantially the entire front surface of the lens.
7. The lens of claim 1 , 2 , 3 or 4 , wherein the diffractive element comprises a surface intermediate a front and a back surface of the lens.
8. The lens of claim 5 , wherein the lens comprises a single vision lens.
9. The lens of claim 6 , wherein the lens comprises a single vision lens.
10. The lens of claim 7 , wherein the lens comprises a single vision lens.
11. The lens of claim 5 , wherein the lens comprises a multifocal lens.
12. The lens of claim 6 , wherein the lens comprises a multifocal lens.
13. The lens of claim 7 , wherein the lens comprises a multifocal lens.
14. A method for producing a customized lens comprising the step of providing a lens comprising a spherical power Φ, a diffractive element comprising a first spherical power Φ D and a refractive element comprising a second spherical power Φ R , wherein the diffractive element comprises a material having an Abbe number of about 30 to about 60, wherein:
Φ
R
V
R
+
Φ
D
V
D
=
0
and wherein V R is the Abbe number of the refractive element of the lens and V D is an effective Abbe number of the diffractive element of the lens.
15. The method of claim 14 , wherein the lens is a single vision lens.
16. The method of claim 14 , wherein the lens is a multifocal lens.