LENTILLA COLOREADA Y PROCEDIMIENTO PARA SU FABRICACION

• Main Authors: BAO, QI-BIN, CHEN, PATRICK, RAWLINGS, DAVID L
• Format: Patent
• Language: Spanish
• Published: 01.08.1994
• Edition: 4
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; CONTACT LENSES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROCESO PARA LA FABRICACION DE UNA LENTE DE CONTACTO MOLDEADA QUE CONTIENE UNA ZONA VISUAL CENTRAL Y TRANSPARENTE CIRCUNSCRITA POR UN IRIS COLOREADO, QUE CONSISTE EN: (A) RECUBRIR CON UN LIQUIDO COLOREADO, QUE PUEDE SER ENDURECIBLE O TERMOPLASTICO, UN MOLDE PARA FABRICAR UNA LENTE DE CONTACTO, EN LA SUPERFICIE DE LA LENTE EN LA QUE ESTA FORMADO EL IRIS, PARA PRODUCIR UNA PELICULA COLOREADA QUE CONTIENE UNA SUPERFICIE EXPUESTA AL INTERIOR DEL MOLDE Y UNA SUPERFICIE EN CONTACTO CON EL MOLDE. (B) CARGAR EL MOLDE CON LA RESINA UTILIZADA PARA FORMAR EL CUERPO DE LA LENTE, A LA VEZ QUE SE MANTIENE LA PELICULA COLOREADA EN LA PARTE DE IRIS Y SE CONFIGURA LA RESINA ALREDEDOR DE LA PELICULA COLOREADA, FORMANDO LA SUPERFICIE DE LA PELICULA UNA SOLA PIEZA CON EL CUERPO DE LA LENTE Y LA SUPERFICIE DE LA PELICULA FORMA PARTE DE LA SUPERFICIE EXTEROR DE LA LENTE CUANDO LA LENTE MOLDEADA ES RETIRADA DEL MOLDE. A process for the manufacture of a molded contact lens containing a transparent central visual region circumscribed by a colored iris portion which comprises a. coating a colored liquid which is either curable or thermoplastic in a mold for making a contact lens onto a surface thereof where the iris portion of the lens is formed to produce a colored film thereon which film contains a surface exposed to the interior of the mold and a surface in contact with the mold, b. charging the mold with the resin used to form the body of the lens while maintaining the colored film in the iris portion and configuring the resin about the colored film whereby the surface of the film becomes integral with the body of the lens and the surface of the film becomes part of the outer surface of the lens when the molded lens is removed from the mold. o