Method for modifying a surface
First Claim
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1. A method of forming a contact lens, comprising the steps of:
- forming a lens mold having a first mold portion defining a first optical surface and a second mold portion defining a second optical surface, wherein said first mold portion and said second mold portion are configured to receive each other such that a lens forming cavity is formed between said first optical surface and said second optical surface;
applying at least one polyanionic or polycationic material to at least one of said optical surfaces to form a polyionic monolayer on said optical surface;
positioning said first mold portion and said second mold portion such that said mold portions receive each other and said optical surfaces define said lens forming cavity;
dispensing a polymerizable substrate material into said lens forming cavity; and
curing said polymerizable substrate material within said lens forming cavity such that a contact lens is formed, whereby at least a portion of said polyionic monolayer detaches from said at least one optical surface of said mold portion and reattaches to said formed contact lens such that said contact lens becomes coated with said portion of said polyionic monolayer.
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Abstract
A method of forming a contact lens within a mold is provided. A coating of a polyionic material(s) is applied to the mold before forming a lens therein. The coating can be applied by spraying or dipping the mold within a solution(s) of polyionic materials. Various other additives can also be applied to the mold. The coating can then be transferred to a contact lens formed within the mold such that the resulting lens has altered surface properties.
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Citations
23 Claims
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1. A method of forming a contact lens, comprising the steps of:
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forming a lens mold having a first mold portion defining a first optical surface and a second mold portion defining a second optical surface, wherein said first mold portion and said second mold portion are configured to receive each other such that a lens forming cavity is formed between said first optical surface and said second optical surface;
applying at least one polyanionic or polycationic material to at least one of said optical surfaces to form a polyionic monolayer on said optical surface;
positioning said first mold portion and said second mold portion such that said mold portions receive each other and said optical surfaces define said lens forming cavity;
dispensing a polymerizable substrate material into said lens forming cavity; and
curing said polymerizable substrate material within said lens forming cavity such that a contact lens is formed, whereby at least a portion of said polyionic monolayer detaches from said at least one optical surface of said mold portion and reattaches to said formed contact lens such that said contact lens becomes coated with said portion of said polyionic monolayer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification