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The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...
Molecular structure of silicone hydrogel used in flexible, oxygen-permeable contact lenses. Typically, soft contact lenses are mass-produced, while rigids are custom-made to exact specifications for the individual patient. Spin-cast lenses – A soft lens manufactured by whirling liquid silicone in a revolving mold at high speed.
Otto Wichterle (Czech pronunciation: [ˈoto ˈvɪxtr̩lɛ]; 27 October 1913 – 18 August 1998) was a Czech chemist, best known for his invention of modern soft contact lenses. Wichterle is the author or co-author of approximately 180 patents and over 200 publications.
Oxygen permeability ( OP) is a parameter of a contact lens that expresses the ability of the lens to let oxygen reach the eye by diffusion. In soft contact lenses, it is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.
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Pages in category "Contact lenses" The following 27 pages are in this category, out of 27 total. ... List of soft contact lens materials; O. Oxygen permeability; R. ReNu;