Scleral contact lens with grooves and method of making lens
The present invention provides a scleral lens which includes channels on its posterior bearing surface that improve the flow of tears between the bearing surface of the device and the underlying scleral eyes tissue into the space between the optic of the lens and cornea. The channels are disposed on the inside surface of the lens and extend generally radially from the inside of the haptic and the outside rim of the lens. Various configurations are possible for the channels, as described in more detail below. Additionally, the channels can have a serpentine or arcuate configuration to allow for the appropriate amount of fluid flow between the space under the lens and the scleral surface of the eye. In another embodiment, microchannels can be formed in the lens to increase the oxygen permeability of the lens. The microchannels can have many configurations that reduce the volume of the lens material.
1. A lens to be disposed on an eye, the lens having a back surface comprising:
(a) an optic portion;
(b) a scleral portion having an outer rim and an inner rim;
(c) at least one generally arcuate groove in the back surface of the scleral portion that extends radially at least part of the distance between the outer rim and the inner rim, the at least one groove having a U-shaped cross section;
(d) at least one circumferential groove disposed circumferentially in the back surface of the scleral portion; and
(e) the at least one generally arcuate groove connects the at least one circumferentially disposed groove to at least one of the outer rim and the inner rim of the scleral portion.
2. The lens of claim 1 wherein the U-shaped generally arcuate groove extends the entire distance between the inner rim and the outer rim of the scleral portion.
3. The lens of claim 1 wherein the U-shaped groove is connected to at least one of the inner rim and outer rim by a microchannel that is smaller cross-section than the U-shaped groove.
4. The lens of claim 3 wherein the U-shaped groove is connected to both the inner rim and the outer rim by a microchannel.
5. The lens of claim 1 , further comprising at least four U-shaped grooves disposed around the scleral portion of the lens.
6. The lens of claim 5 wherein the U-shaped grooves are spaced equally around the scleral portion of the lens.
7. A lens to be disposed on an eye,the lens comprising:
an optic portion and a scleral portion, the scleral portion having an outer rim an inner rim, at least one generally arcuate groove formed in the back surface of the scleral portion, the at least one generally arcuate groove having a non-rectangular cross section; at least one circumferential groove disposed circumferentially on the back surface of the scleral portion and the at least one generally arcuate groove connects the at least one circumferentially disposed groove to at least one of the outer rim and the inner rim of the scleral portion.
8. The lens of claim 7 wherein the generally arcuate groove includes walls and a base, further comprising an angle greater than 90 degrees between at least one of the walls and the base.
9. The lens of claim 7 wherein the generally arcuate groove includes walls and a base, further comprising an angle less than 90 degrees between at least one of the walls and the base.
10. The lens of claim 7 wherein the generally arcuate groove is U-shaped and is connected to at least one of the inner rim and outer rim by a microchannel that is smaller cross-section than the U-shaped groove.
11. The lens of claim 10 wherein the U-shaped groove is connected to both the inner rim and the outer rim by a microchannel.
12. The lens of claim 10 , further comprising at least four U-shaped grooves disposed around the scleral portion of the lens.
13. The lens of claim 12 wherein the U-Shaped grooves are spaced equally around the scleral portion of the lens.