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  2. List of soft contact lens materials - Wikipedia

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

    planned replacement contact lenses. 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.

  3. Essilor - Wikipedia

    en.wikipedia.org/wiki/Essilor

    In 2020, about 88.8% of Essilor's turnover came from the sale of ophthalmic lenses and optical instruments, 8.9% driven by sunglasses and readers and 2.3% from other activities, such as equipment sales.

  4. Pentax cameras - Wikipedia

    en.wikipedia.org/wiki/Pentax_cameras

    Due to the smaller size of the CCD, lenses have an effective field of view of 1.5 × times the same lens in 35 mm format. So, where a 50 mm lens was considered a "normal" lens on 35 mm film, that same lens on a 1.5× "crop factor" camera has the field of view of a 75 mm lens on film. This only uses the center of the lens' projected image.

  5. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to correct vision or for cosmetic or therapeutic reasons.

  6. Nikon - Wikipedia

    en.wikipedia.org/wiki/Nikon

    Nikon's products include cameras, camera lenses, binoculars, microscopes, ophthalmic lenses, measurement instruments, rifle scopes, spotting scopes, and equipment related to semiconductor fabrication, such as 'steppers' used in the photolithography steps of such manufacturing. Nikon is the world's second largest manufacturer of such equipment.

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

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

    One or two years of hard contact lens wear has not been shown to affect corneal sensitivity, but real changes are observed following five years of hard contact lens wear. However, this significant decrease in corneal sensitivity appears to be reversible.