cornea.
Described more specifically, the contact lens of this mode of the invention is worn on the cornea and pressed onto the cornea upon application of an external pressing force thereon. Such an external pressing force is applied on an anterior surface of the contact lens, by the eyelids of the lens wearer, when the lens wearer blinks. As a result, the posterior surface of the contact lens is located adjacent to the surface of the cornea as close as possible, making it possible to restrict the displacement of the contact lens relative to the cornea. In this respect, the convex portion has the outwardly curved surface with no peak or junction, thus minimizing or eliminating adverse effects of the convex portion on the corner. Further, the convex portionto the optical zone along knots lying on tangents common to curves of the optical zone and the continuous surface, and joins to the inner circumferential portion of the intermediate zone along knots lying on tangents common to curves of the intermediate zone and the continuous surface, while the intermediate zone is connected at an outer circumferential portion thereof to the peripheral zone with a second continuous surface which joins to the peripheral zone along knots lying on tangents common to curves of the peripheral zone and the continuous surface, and joins to the outer circumferential portion of the intermediate zone along knots lying on tangents common to curves of the intermediate zone and the continuous surface. The contact lens according to this mode of the invention has