Contact lens stock holding apparatus
The present invention is directed toward the design of a holding apparatus which allows contact lens lathes to hold contact lens buttons during the contact lens manufacturing process. The holding apparatus functions to hold lenses manufactured from a different sized stock than what the lens manufacturing equipment is designed to hold. In general the holding apparatus has a circular portion having a mating surface on a one side and a cylindrical protrusion extending from the other side. A contact lens lathe can hold the cylindrical protrusion of the holding apparatus while the mating surface mates with a surface on a contact lens button. The lens button and holding apparatus surfaces can be modified to allow more efficient machining of the lens buttons.
1. A method for turning contact lens stock comprising:
cutting a lens button stock from a lens rod stock, wherein the lens button stock is cut from the lens rod stock to have a concave surface and an opposite convex surface on the lens button stock;
coating a mating surface of a lens button stock holding apparatus with an adhesive, wherein the mating surface is configured to mate uniformly with either the concave surface or the opposite convex surface;
attaching the mating surface to the lens button stock;
positioning a protrusion of the lens button stock holding apparatus in a collet on a lathe;
turning the lens stock to the desired specifications to create a lens; and
bathing the lens in a solvent to remove the lens button stock holding apparatus from the lens.