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  2. List of soft contact lens materials - Wikipedia

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

    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 ...

  3. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    A pair of contact lenses, positioned with the concave side facing upward. Putting contacts in and taking them out. One-day disposable contact lenses with blue handling tint in blister-pack packaging. Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used ...

  4. Optical flow - Wikipedia

    en.wikipedia.org/wiki/Optical_flow

    The direction and magnitude of optic flow at each location is represented by the direction and length of each arrow. Optical flow or optic flow is the pattern of apparent motion of objects, surfaces, and edges in a visual scene caused by the relative motion between an observer and a scene. [1] [2] Optical flow can also be defined as the ...

  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, etc. Other changes may include the formation of epithelial vacuoles and microcysts (containing cellular debris) as well as the emergence of polymegethism in the corneal endothelium.

  6. Circle contact lens - Wikipedia

    en.wikipedia.org/wiki/Circle_contact_lens

    Circle contact lens. 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. It has become a trend throughout East, South and Southeast Asia and is largely produced in Japan, South Korea and China .

  7. Optical aberration - Wikipedia

    en.wikipedia.org/wiki/Optical_aberration

    Optical aberration. 1: Imaging by a lens with chromatic aberration. 2: A lens with less chromatic aberration. In optics, aberration is a property of optical systems, such as lenses, that causes light to be spread out over some region of space rather than focused to a point. [1]

  8. Gradient-index optics - Wikipedia

    en.wikipedia.org/wiki/Gradient-index_optics

    Gradient-index optics. A gradient-index lens with a parabolic variation of refractive index ( n) with radial distance ( x ). The lens focuses light in the same way as a conventional lens. Gradient-index ( GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material.

  9. Google Contact Lens - Wikipedia

    en.wikipedia.org/wiki/Google_Contact_Lens

    Google Contact Lens was a smart contact lens project announced by Google on 16 January 2014. [1] The project aimed to assist people with diabetes by constantly measuring the glucose levels in their tears. [2] The project was being carried out by Verily and as of 2014 was being tested using prototypes. [1]

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