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leonardo da vinci illustrated the concept of contact lenses.
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the first contact lenses were made from glass. they were fitted to fit the entire eye.
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designed to cover only the eye's cornea. made from plastics called hydrogels. they absorbed water to keep the lenses soft.
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silicone lenses were first marketed in 2002. they allowed more oxygen to pass through the lens.
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hydrogel lenses became available in all prescriptions and sizes. which reduced the amount of complications.
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todays lenses can correct conditions such as keratoconus and aniseikonia. whoch effect sight. always they can change the appearence of your eyes.
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Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.