Soft toric lens for correction of astigmatism

Details Soft toric lens for correction of astigmatism Soft toric lens for correction of astigmatism

G - Physics

02

C

G02C 7/04 (2006.01)

Patent

CA 2096706

ABSTRACT OF THE DISCLOSURE A toric contact lens for correction of astigmatism comprises a concave posterior surface to be applied to a wearer's eye, and a convex anterior surface symmetrical about an horizontal plane of symmetry. The anterior surface comprises a central optical zone, and a pair of upper and lower peripheral prismatic zones situated outside the central optical zone and symmetrical about the horizontal plane of symmetry. Each prismatic zone defines an apex along the peripheral edge of the lens, and the lens has, in the region of each prismatic zone, a thickness that gradually increases from this apex toward the central optical zone whereby sliding movement of the eyelids on the prismatic zones pushes these zones to produce a stabilizing effect that maintains the contact lens in a desired, predetermined orientation. The anterior surface further comprises an intermediate aspheric zone surrounding the central optical zone and forming a smooth transition surface between this optical zone and the two peripheral prismatic zones.

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