Foldable intraocular lens and method of making
A foldable intraocular lens for providing vision contains an optic body that includes an optical zone and a peripheral zone entirely surrounding the optical zone. The optic body has an anterior face, a substantially opposing posterior face, an optic edge, and an optical axis. The anterior face comprises a central face, a peripheral face, and a recessed annular face therebetween that is disposed posterior to the peripheral face. The intraocular lens further comprises at least one haptic that is integrally formed with the peripheral zone. The haptic comprises a distal posterior face, a proximal posterior face, and a step edge disposed at a boundary therebetween. The haptic further comprises a side edge disposed between the optic edge and the step edge. The proximal posterior face and the posterior face of the optic body form a continuous surface. An edge corner is formed by the intersection of the continuous surface with the optic edge, the side edge, and the step edge.
1. A foldable intraocular lens, comprising:
an optic body including an optical zone and a peripheral zone entirely surrounding the optical zone, the optic body having an anterior face, a substantially opposing posterior face, an optic edge, and an optical axis, the anterior face comprising a central face, a peripheral face, and a recessed annular face therebetween disposed posterior to the peripheral face, the recessed annular face encircling the optical axis;
first and second haptics integrally formed with the peripheral zone, each having a distal posterior face, a proximal posterior face, and a distal portion, and each haptic characterized by a haptic thickness equal to a distance along the optical axis between the distal posterior face and a substantially opposing haptic anterior face, each haptic comprising:
a boundary between the proximal posterior face and the distal posterior face, the distal posterior face being offset at the boundary from the proximal posterior face in a direction along the optical axis to form a step edge;
a side edge disposed between the optic edge and the step edge;
a buttress formed in between the optic edge and the step edge having a haptic thickness that is greater than the haptic thickness at the distal portion, wherein the buttress causes a biasing force that biases the distal portion of the haptic away from the optical zone; and
a continuous surface formed by the proximal posterior face and the posterior face of the optic body.
2. The foldable intraocular lens of claim 1 , further comprising an edge corner formed by an intersection of the continuous surface with the optic edge, the side edge, and the step edge.
3. The foldable intraocular lens of claim 1 , wherein the step edge has a height that is in the range of 0.05 mm to 1 mm.
4. The foldable intraocular lens of claim 1 , wherein the haptic thickness is greater than or approximately equal to an optic edge thickness of the optic edge along the optical axis.
5. The foldable intraocular lens of claim 4 , wherein at least one of the haptic thickness or the optic edge thickness along the optical axis is in the range of at about 0.2 mm or less to about 1 mm or more.
6. The foldable intraocular lens of claim 1 , wherein the step edge has a height H and the optic edge has a thickness T.
7. The foldable intraocular lens of claim 6 , wherein the height H is less than the thickness T.
8. The foldable intraocular lens of claim 7 , wherein the thickness T is in the range of about 0.4 mm to about 0.5 mm.
9. The foldable intraocular lens of claim 1 , wherein at least a portion of the boundary forms a substantially straight line.
10. The foldable intraocular lens of claim 1 , wherein the step tapers radially.
11. The foldable intraocular lens of claim 1 , wherein the lens is made of a polymeric material.
12. The foldable intraocular lens of claim 1 , wherein the step edge has a portion with an arcuate shape.
13. The foldable intraocular lens of claim 1 , wherein the step edge is a straight line.
14. The foldable intraocular lens of claim 1 , wherein the optic body has a center thickness in the range of about 150 microns to about 1000 microns.