| 摘要 |
An aspheric multifocal contact lens for wearing by a patient with presbyopia is disclosed. The lens has a lens body with a rear surface adapted to fit on the surface of the eye and a front surface that interacts with the rear surface to bring about the desired optics of the lens. The lens also has a centrally located and generally circular first optic zone providing a first power correction for near vision, and a second optic zone concentric with the first optic zone and located peripherally therefrom providing a second power correction for distance vision. A transition zone concentric with the first optic zone is located between said first and second optic zones. The transition zone provides a rapid power shift of about 0.8 to about 1.6 diopters over a distance of about 0.25 mm between the power correction of the first and second zones. |
