Method for preparing contact lens having polymer multilayer film

Abstract

A method for preparing a contact lens having a polymer multilayer film is provided. The method includes chemically conjugating a polymer film to a surface of a lens body, and then producing another polymer film by utilizing ion adsorption between a negative charge and a positive charge of the polymer substance to form a polymer multilayer film comprising the two polymer films bonded well on the surface of the lens body. When the contact lens is worn, the polymer multilayer film provides a smoother touch to the surface of the eye, and a higher water content can be achieved, which improves the comfort of wearing.

Description

technical field [0001] The invention relates to a preparation method of a contact lens, in particular to a preparation method of a contact lens with a polymer multilayer film. Background technique [0002] The main problem that accompanies the use of contact lenses is dryness. Consequently, there has been a trend towards increased use of higher gas permeable materials in the manufacture of contact lenses, which has also driven the use of silicone-based materials. On the other hand, these materials are hydrophobic in nature and repel water. Even with plasma surface treatment to create a hydrophilic surface, these lenses may develop water-repelling regions, which result in reduced water-breakup time. These areas also have a tendency to attract more lipid and protein deposits. [0003] In order to improve these problems, contact lenses can be coated with the required materials on the surface. Coating materials can be selected according to the desired properties. Typically,...

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Problems solved by technology

However, this layer-by-layer coating has poor adhesion to the substrate

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