What type of contact lens has a primary base curve and a peripheral curve?

The type of contact lens that features a primary base curve and a peripheral curve is known as a bicurve lens. These lenses are designed with two curves: the primary base curve, which is the main curvature of the lens that fits the central part of the cornea, and the peripheral curve, which provides a gradual transition away from the base curve to enhance comfort and fit onto the sclera, the white part of the eye.

The design of bicurve lenses allows for better alignment with the anatomical variations of the eye, especially for patients with irregularities or for those who require a more customized fit. This dual-curvature approach helps distribute pressure evenly across the eye's surface and can improve tear circulation underneath the contact lens, aiding in overall eye health and comfort.

Other lens types do not typically incorporate both a primary and a distinct peripheral curve in the same manner as bicurve lenses, making them less suited for similar fitting needs.