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  2. List of soft contact lens materials - Wikipedia

    en.wikipedia.org/wiki/List_of_soft_contact_lens...

    In the US market, soft contact lenses are approved by the US Food and Drug Administration. [2] The American Optometric Association published a contact lens comparison chart called Advantages and Disadvantages of Various Types of Contact Lenses on the differences between them. [3] These include: soft contact lenses; rigid gas-permeable (RGP ...

  3. Toric lens - Wikipedia

    en.wikipedia.org/wiki/Toric_lens

    Toric lens surface as "cap" (top-right) from a torus (here with R = 1.2 r). A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical .

  4. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Artist's impression of Leonardo's method for neutralizing the refractive power of the cornea. Leonardo da Vinci is frequently credited with introducing the idea of contact lenses in his 1508 Codex of the eye, Manual D, [9] wherein he described a method of directly altering corneal power by either submerging the head in a bowl of water or wearing a water-filled glass hemisphere over the eye.

  5. What to Know About Colored Contacts—and Why You Shouldn’t Buy ...

    www.aol.com/lifestyle/know-colored-contacts-why...

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  6. Circle contact lens - Wikipedia

    en.wikipedia.org/wiki/Circle_contact_lens

    Comparison between a natural dark brown eye and hazel circle contact lens (notice the size difference) A circle contact lens, also known as a big eye contact lens and circle lens, is a cosmetic (non-corrective and decorative) contact lens that makes the eye's iris appear larger.

  7. A woman paid $12,000 for surgery to permanently turn her eyes ...

    www.aol.com/news/woman-paid-12-000-surgery...

    Ulku Dogan had surgery to make her eyes blue after wearing colored contact lenses for years. Keratopigmentation involves making a channel in the cornea and placing colored dye inside.

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