Soft toric contact lens
First Claim
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1. A soft toric contact lens of spherocylindrical power having a concave inner surface, a convex outer surface, a horizontal axis and a vertical axis;
- said outer surface having a central optical zone and a peripheral lenticular zone;
said lens including a prism ballast in the vertical axis, the degree of prism being greater than about 1.0 diopter;
the outer surface of said lens having a smoothly beveled, tapered-off region in the lenticular zone in the area of maximum ballast, the edge of said lens having a substantially uniform thickness in said tapered-off region.
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Abstract
A soft toric contact lens having spherocylindrical power for correcting astigmatism in humans and utilizing a prism ballast as a means of maintaining correct axial orientation. The degree of prism is greater than 1.0 diopter, and the peripheral outer surface of the lens is tapered off to a relatively thin edge of constant thickness over a substantial portion of the ballast area.
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Citations
8 Claims
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1. A soft toric contact lens of spherocylindrical power having a concave inner surface, a convex outer surface, a horizontal axis and a vertical axis;
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said outer surface having a central optical zone and a peripheral lenticular zone; said lens including a prism ballast in the vertical axis, the degree of prism being greater than about 1.0 diopter; the outer surface of said lens having a smoothly beveled, tapered-off region in the lenticular zone in the area of maximum ballast, the edge of said lens having a substantially uniform thickness in said tapered-off region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification