Aspheric toric intraocular lens
View Patent ↗An aspheric toric intraocular lens (IOL) having toricity and asphericity in a single lens. The toricity and asphericity may be provided on separate surfaces, such as an anterior surface and a posterior surface, or the toricity and asphericity may be combined onto a single surface. The edge thickness may be varied sinusoidal to maintain equal edge thickness at 45 degree meridian.
1. An ophthalmic device, comprising:
an ophthalmic lens having an anterior surface and a posterior surface; and
one or more haptics coupled to the ophthalmic lens;
wherein one of the posterior or anterior surfaces is shaped so that the ophthalmic lens is configured as an aspheric lens and one of the posterior or anterior surfaces is shaped so that the ophthalmic lens is configured as a toric lens, wherein the ophthalmic lens has a selected edge thickness that varies periodically around the ophthalmic lens, and wherein the selected edge thickness is equal at 45 degree meridians of the ophthalmic lens and is between 0.2 and 0.3 mm at the 45 degree meridians.
2. The ophthalmic device of claim 1 , wherein the posterior surface is shaped so that the ophthalmic lens is configured as the aspheric lens and the toric lens.
3. The ophthalmic device of claim 1 , wherein the anterior surface is shaped so that the ophthalmic lens is configured as the aspheric lens and the toric lens.
4. The ophthalmic device of claim 1 , wherein the posterior surface is shaped so that the ophthalmic lens is configured as an aspheric lens and the anterior surface is shaped so that the ophthalmic lens is configured as a toric lens.
5. The ophthalmic device of claim 1 , wherein the anterior surface is shaped so that the ophthalmic lens is configured as an aspheric lens and the posterior surface is shaped so that the ophthalmic lens is configured as a toric lens.
6. The ophthalmic device of claim 1 , wherein the aspheric surface is shaped with a single asphericity for all cylinder meridians.
7. The ophthalmic device of claim 1 , wherein the aspheric surface is shaped with a first asphericity for a first meridian and a second asphericity for a second meridian.
8. The ophthalmic device of claim 1 , wherein the first and second meridians are the principle meridians.
9. The ophthalmic device of claim 1 , wherein the haptics are roughened to promote adherence with biological material.
10. The ophthalmic device of claim 1 , wherein the ophthalmic device comprises a set of markers placed to aid alignment of the ophthalmic lens relative to one or more meridians of an astigmatism.
11. An ophthalmic lens comprising:
an anterior surface; and
a posterior surface
one of the anterior or posterior surface having asphericity and one of the anterior or posterior surface having toricity, wherein the ophthalmic lens has a selected edge thickness that varies periodically around the ophthalmic lens, and wherein the selected edge thickness is equal at 45 degree meridians of the ophthalmic lens and is between 0.2 and 0.3 mm at the 45 degree meridians.
12. The ophthalmic lens of claim 11 , wherein a single surface is shaped with asphericity and toricity.
13. The ophthalmic lens of claim 12 , wherein the single surface is defined by:
sag
1
=
toric
(
r
,
θ
)
,
wherein
toric
(
R
avg
,
r
,
θ
)
=
(
c
x
cos
2
θ
+
c
y
sin
2
θ
)
r
2
1
+
1
-
(
1
+
k
k
)
c
x
2
r
2
cos
2
θ
-
(
1
+
k
y
)
c
y
2
r
2
sin
2
θ
,
wherein
c
x
=
1
R
x
,
c
y
=
1
R
y
14. The ophthalmic lens of claim 11 , wherein one of the anterior surface and the posterior surface has the toricity and the other has the asphericity.
15. The ophthalmic lens of claim 14 , wherein the toric surface and the aspheric surface are defined respectively by:
sag
1
=
toric
(
r
,
θ
)
and
sag
2
=
asph
(
r
)
,
wherein
:
toric
(
r
,
θ
)
=
(
c
x
cos
2
θ
+
c
y
sin
2
θ
)
r
2
1
+
1
-
(
1
+
k
x
x
)
c
x
2
r
2
cos
2
θ
-
(
1
+
k
y
)
c
y
2
r
2
sin
2
θ
,
and
c
x
=
1
R
1
x
,
c
y
=
1
R
1
y
and
asph
(
r
)
=
cr
2
1
+
1
-
(
1
+
k
)
c
2
r
2
,
c
=
1
R
2
.