| 摘要 |
The contact lens has a fused construction with improved comfort, reduced optical distortions, such as halos, reduced discontinuities, and improved mechanical stability. The lens has an inside portion extending from a periphery of the lens over a concave side of the lens, and a second central exterior portion fused to the first portion. A central zone provides a first optic power and a first concentric band providing a second optic power. A central interface between the first and second portions has a curvature substantially the same as a curvature of the concave side. The second portio n forms a junction with the first portion on a convex side of the lens substantially outside of a field of view of a user's eye. A transition profi le between the junction and the central interface determines, along with the first and the second indices of refraction, the second optic power.
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