IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
UP-0609852
(2006-12-12)
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| 등록번호 |
US-7628485
(2009-12-16)
|
|
발명자
/ 주소 |
- Back, Arthur
- Dean, Gregg A.
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| 출원인 / 주소 |
- Coopervision International Holding Company, LP
|
| 대리인 / 주소 |
Stout, Uxa, Buyan & Mullins, LLP
|
| 인용정보 |
피인용 횟수 :
0 인용 특허 :
133 |
초록
▼
A contact lens having a rotational stabilization mechanism thereon, such as prism ballast, and a thickness profile that reduces the torque imparted on the lens by the action of the eyelids, especially for stabilizing toric lenses. The prism ballast is provided on one or more portions of the anterior
A contact lens having a rotational stabilization mechanism thereon, such as prism ballast, and a thickness profile that reduces the torque imparted on the lens by the action of the eyelids, especially for stabilizing toric lenses. The prism ballast is provided on one or more portions of the anterior face of the lens such that the lens body has a uniform thickness of within 10% along horizontal cross-sections. The anterior face of the lens may be segregated into a peripheral zone, an inner zone circumscribed by the peripheral zone, and a central optic zone. The prism ballast portion is provided within the inner zone, which may be further subdivided into a superior portion, an intermediate portion proximate the optic zone, and an inferior portion. The ballast portion increases in thickness along a superior-inferior line parallel to a vertical meridian, and has a substantially uniform thickness perpendicular thereto. The peripheral zone may be tapered, and have a rounded edge. The rate of thickness change across any portion of the peripheral zone is less than about 250 μm/mm.
대표청구항
▼
What is claimed is: 1. A contact lens, comprising: a rotationally stabilized silicone-hydrogel contact lens body having an anterior face, a posterior face, and a rounded peripheral edge posterior portion, the body having a thickness between the anterior face and the posterior face, a superior edge
What is claimed is: 1. A contact lens, comprising: a rotationally stabilized silicone-hydrogel contact lens body having an anterior face, a posterior face, and a rounded peripheral edge posterior portion, the body having a thickness between the anterior face and the posterior face, a superior edge and an opposing inferior edge, and a vertical meridian defined from the superior edge toward the inferior edge and a horizontal meridian perpendicular thereto; and the lens body comprising a centrally located optic zone surrounding an optical axis of the lens body, and an optic circumscribing zone comprising a superior portion between a superior extent of the optic zone and a superior extent of the optic circumscribing zone, an inferior portion between an inferior extent of the optic zone and an inferior extent of the optic circumscribing zone, and at least one region in the superior portion or the inferior portion having a substantially uniform horizontal thickness. 2. The contact lens of claim 1, wherein the lens body includes a ballast. 3. The contact lens of claim 2, wherein the ballast is selected from the group consisting of prism ballasts and periballasts. 4. The contact lens of claim 1, wherein the lens body includes a midsection having a greater thickness relative to a superior section and an inferior section of the lens body. 5. The contact lens of claim 1, wherein the lens body has an increasing thickness from the superior edge of the lens body toward the optic zone along a line parallel to the vertical meridian. 6. The contact lens of claim 1, wherein the lens body has a maximum thickness at a region located between the optic zone and the inferior edge of the lens body. 7. The contact lens of claim 1, wherein the optic circumscribing zone further comprises an intermediate portion located between the superior portion and the inferior portion, and includes a ballast portion defined within one or more of the superior, intermediate, and inferior portions and has a series of consecutive horizontal cross-sections exclusive of the optic zone spanning a distance along the vertical meridian of at least 20% of the smallest dimension of the superior, intermediate, and inferior portions as measured along the vertical meridian, wherein each horizontal cross-section has a substantially uniform thickness not varying by more than about 30 μm or 20%, whichever is greater in absolute terms. 8. The contact lens of claim 7, wherein the ballast portion is defined wholly within only one of the superior, intermediate, and inferior portions. 9. The contact lens of claim 7, wherein the ballast portion is defined wholly within only two of the superior, intermediate, and inferior portions. 10. The contact lens of claim 7, wherein the ballast portion is defined within all three of the superior, intermediate, and inferior portions. 11. The contact lens of claim 1, further including a cylindrical correction on either the anterior face or the posterior face. 12. The contact lens of claim 11, wherein the cylindrical correction is provided on the posterior face, and wherein the optic zone of the anterior face comprises a spherical correction. 13. The contact lens of claim 1, wherein the optic circumscribing zone is of substantially uniform radial width around the circumference of the lens. 14. The contact lens of claim 1, wherein the lens further incorporates a negative spherical power distance correction. 15. The contact lens of claim 1, wherein the optic circumscribing zone comprises a plurality of regions represented by imaginary horizontal bands extending from an outer edge of the optic circumscribing zone towards the vertical meridian of the lens body, each band having a constant thickness across the lens body. 16. The contact lens of claim 1, wherein the optic circumscribing zone comprises a plurality of regions represented by substantially horizontal bands extending from an outer edge of the optic circumscribing zone towards the vertical meridian of the lens body, each band having a substantially uniform thickness, and the thickness of the optic circumscribing zone varies vertically less than about 400% of the minimum thickness of the optic circumscribing zone. 17. The contact lens of claim 1, wherein the thickness of the lens body varies from a superior-most portion of the optic circumscribing zone to an inferior-most portion of the optic circumscribing zone by no greater than about 210 micrometers. 18. The contact lens of claim 1, wherein the optic circumscribing zone has a vertical lens thickness profile parallel to the vertical meridian, the vertical lens thickness profile having a thickness that varies by less than about 400% of the minimum thickness of the optic circumscribing zone. 19. The contact lens of claim 1, wherein the optic circumscribing zone comprises a first region extending from the optic zone on one side of the vertical meridian, and a second region extending from the optic zone on the opposite side of the vertical meridian. 20. The contact lens of claim 1, wherein the at least one region is located superior to the optic zone. 21. The contact lens of claim 1, wherein, along a straight line representing a 225° meridian, the straight line distance between the optic circumscribing zone and the peripheral edge is less than 1.4 mm. 22. The contact lens of claim 1, wherein the at least one region is located inferior to the optic zone. 23. The contact lens of claim 1 which is cast molded and is subjected to no post-formation processing to alter the rounded configuration of the peripheral edge posterior portion. 24. The contact lens of claim 1, wherein the rounded peripheral edge posterior portion is substantially smooth. 25. A contact lens, comprising: a rotationally stabilized silicone-hydrogel contact lens body having an anterior face, a posterior face, and a rounded posterior peripheral edge surface, the body having a thickness between the anterior face and the posterior face, a superior edge and an opposing inferior edge, and a vertical meridian defined from the superior edge toward the inferior edge and a horizontal meridian perpendicular thereto; and the lens body comprising a centrally located optic zone surrounding an optical axis of the lens body, and an optic circumscribing zone comprising a superior portion between a superior extent of the optic zone and a superior extent of the optic circumscribing zone, an inferior portion between an inferior extent of the optic zone and an inferior extent of the optic circumscribing zone, the superior portion, the inferior portion, or both the superior and inferior portion having a series of consecutive horizontal cross-sections, each horizontal cross-section having a substantially uniform horizontal thickness, wherein, along a straight line representing a 225° meridian, the straight line distance between the optic circumscribing zone and the peripheral edge is less than 1.4 mm. 26. The contact lens of claim 25, wherein the optic circumscribing zone has an inner border adjacent to an outer border of the optic zone. 27. The contact lens of claim 25, wherein the entire optic circumscribing zone has a series of consecutive horizontal cross-sections, exclusive of the optic zone, each horizontal cross-section having a substantially uniform thickness. 28. The contact lens of claim 25, wherein the optic circumscribing zone further comprises a ballast. 29. The contact lens of claim 28, wherein the ballast comprises a series of consecutive horizontal cross-sections, each horizontal cross-section having a substantially uniform thickness.
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