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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. 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.

  4. Limbal ring - Wikipedia

    en.wikipedia.org/wiki/Limbal_ring

    Prominent limbal ring Light brown iris with a distinct limbal ring. A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [2]

  5. Effects of long-term contact lens wear on the cornea - Wikipedia

    en.wikipedia.org/wiki/Effects_of_long-term...

    Long-term contact lens use can lead to alterations in corneal thickness, stromal thickness, curvature, corneal sensitivity, cell density, and epithelial oxygen uptake. . Other structural changes may include the formation of epithelial vacuoles and microcysts (containing cellular debris), corneal neovascularization, as well as the emergence of polymegethism in the corneal endoth

  6. Tasmanite (mineral) - Wikipedia

    en.wikipedia.org/wiki/Tasmanite_(mineral)

    Translucent reddish-brown or brown varieties grown into the Tasmanite shale ultimately accounted for up to 40% of the main rock and had the appearance of narrow scaly lenses, difficult to separate from the main rock. [8]: 317 It is also known that this deposit itself had a small size and was located near the floodplain of the River Mersey ...

  7. Rigid gas permeable lens - Wikipedia

    en.wikipedia.org/wiki/Rigid_gas_permeable_lens

    A rigid gas-permeable lens, also known as an RGP lens, GP lens, or colloquially, a hard contact lens, is a rigid contact lens made of oxygen-permeable polymers. Initially developed in the late 1970s, and through the 1980s and 1990s, they were an improvement over prior 'hard' lenses that restricted oxygen transmission to the eye.

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