What is the design of a single-cut contact lens?
The anterior surface of a single-cut contact lens is a continual curvature,the front optic zone radius, associated with the anterior optic zone.
The posterior surface of a tricurve lens is formed of three or more
curves:
1. The central posterior curve, or base curve, is designed to fit the curvature of the cornea.
2. The secondary posterior curve provides a transition between the base curve and the peripheral posterior curve.
Multicurve contact lenses may have more than one intermediate posterior curve in order to create a gradual transition.
3. A peripheral curve is designed to create a smooth transition between the base curve and the edge of the lens, facilitating the exchange of tear film under the contact lens with each blink.
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Contact lens