Abstract: The invention relates to a discharge nozzle for a tube of sealant materials which is provided with an aperture or slot that allows the user to monitor the rate of flow of sealant from the tube to assist in the formation of a smooth bead or fillet of sealant material when it is applied through the nozzle to a substrate.

Abstract: A contact lens of a preselected mass has an optical zone and at least one peripheral zone. The optical zone has a shape and thickness sufficient to result in a desired optical correction. At least one peripheral zone has a thickness selected to correspond with that of the optical zone so as to result in the lens having the preselected mass. In a preferred embodiment, the lens has an optical zone, an intermediate peripheral zone and an outer peripheral zone. The intermediate peripheral zone has a thickness which is varied to correspond with that of the optical zone and the outer peripheral zone has parallel carriers. The preferred embodiment may have an inner surface shaped so that the radius of curvature of the optical zone is substantially equal to that of the cornea at its optical centerline, the peripheral curves have centers of curvature offset from the centerline of the optical zone and the curves are tangent where they meet.

Abstract: This is a method and apparatus for machining a flexible silicone contact lens which utilizes a moving, flexible abrasive tape bearing against the rotating lens to accomplish the desired result. The tape travels in a transverse direction across the lens and may be oscillated to provide a more uniform finish.