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In page Contact lens:
"In 1998, the first silicone hydrogel contact lenses were released by Ciba Vision in Mexico.[7] These new materials encapsulated the benefits of silicone which has extremely high oxygen permeability—with the comfort and clinical performance of the conventional hydrogels that had been used for the previous 30 years. These contact lenses were initially advocated primarily for extended (overnight) wear, although more recently, daily (no overnight) wear silicone hydrogels have been launched.[citation needed]
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