Method of selectively tinting cast lenses
OwnerCharles W. Neefeinventor
Life of this patent
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Abstract
A method of coloring predetermined areas of cast contact lenses by placing a coating of soluble dye on the mold surface in the area to be colored. The liquid lens monomer is added to the mold and dissolves the dye from the mold surface before being polymerized to form a solid contact lens. After being polymerized the lens containing the dye in its polymer structure is removed from the mold.
Claims16
A method of coloring selected areas of spin cast contact lenses by the steps of providing a concave spin cast mold having a concave radius equal to the convex lens radius, placing a dye soluble in the lens monomer on the selected areas of the concave mold surface, placing the liquid lens monomer on the concave spin cast mold surface, rotating the spin cast mold around the lens optical axis and perpendicular to the concave spin cast mold surface, allowing the liquid lens monomer to dissolve the soluble dye present on the concave mold surface, allowing the liquid lens monomer containing the soluble dye to polymerize and form a solid contact lens and the dye being contained within the selected areas of the lens, removing the colored lens from the spin cast mold.
A method of casting lenses having a selected area of color by the steps of placing a colorant soluble in the liquid lens monomer on a selected area of the lens mold optical surface, adding the liquid lens monomer to the optical lens mold, allowing the liquid lens monomer to dissolve the colorant from the lens mold optical surface, allowing the liquid lens monomer to polymerize to form a solid lens containing the colorant in the selected area of the lens, removing the lens from the lens mold.
A method of casting lenses having a selected area of color by the steps of placing a colored pigment soluble in the liquid lens monomer on a selected area of the lens mold optical surface, adding the liquid lens monomer to the optical lens mold, allowing the liquid lens monomer to dissolve the colored pigment from the mold optical surface, allowing the liquid lens monomer to polymerize to form a solid lens containing the colored pigment in the selected area of the lens, removing the lens from the mold.
Dependencies are inferred from the claim text.