Hydrogel processing

Details Hydrogel processing Hydrogel processing

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 33/60 (2006.01) B29C 35/04 (2006.01) B29C 71/00 (2006.01)

Patent

CA 2537550

Disclosed are methods and apparatus for hydrating ophthalmic lenses and leaching excess materials from the ophthalmic lenses. The methods include the steps of exposing contact lenses with a hydration solution comprising about 30 to 70 percent isopropyl alcohol and water. In some embodiments, the hydration solution is maintained at an elevated temperature. Exposure to a first hydration solution causes the ophthalmic lenses to swell to a size larger than their functional size, and exposure to a second ophthalmic solution causes the lenses to shrink back to a functional size.

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