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  2. Visual snow syndrome - Wikipedia

    en.wikipedia.org/wiki/Visual_snow_syndrome

    Uncommon (understudied) Visual snow syndrome ( VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field. [ 7][ 4] Other common symptoms are palinopsia, enhanced entoptic phenomena, photophobia, and ...

  3. Astigmatism (optical systems) - Wikipedia

    en.wikipedia.org/wiki/Astigmatism_(optical_systems)

    Astigmatism causes difficulties in seeing fine detail. Astigmatism can be often corrected by glasses with a lens that has different radii of curvature in different planes (a cylindrical lens), contact lenses, or refractive surgery. [5] Astigmatism is quite common. Studies have shown that about one in three people suffers from it.

  4. Diffraction spike - Wikipedia

    en.wikipedia.org/wiki/Diffraction_spike

    Diffraction spike. Diffraction spikes are lines radiating from bright light sources, causing what is known as the starburst effect[ 1] or sunstars[ 2] in photographs and in vision. They are artifacts caused by light diffracting around the support vanes of the secondary mirror in reflecting telescopes, or edges of non-circular camera apertures ...

  5. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Visual impairment. Visual or vision impairment ( VI or VIP) is the partial or total inability of visual perception. In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [ 6]

  6. Got Dark Circles? This Procedure Can Fix Them - AOL

    www.aol.com/got-dark-circles-procedure-fix...

    The main purpose of under-eye filler is to give your eyes a smoother, more radiant, and more “awake” look. “These fillers address issues like hollowing and volume loss, which improves the ...

  7. Lens flare - Wikipedia

    en.wikipedia.org/wiki/Lens_flare

    Lens flare on Borobudur stairs to enhance the sense of ascending. A lens flare is often deliberately used to invoke a sense of drama. A lens flare is also useful when added to an artificial or modified image composition because it adds a sense of realism, implying that the image is an un-edited original photograph of a "real life" scene.

  8. 7 Most Common Causes of Dark Undereye Circles - AOL

    www.aol.com/lifestyle/7-most-common-causes-dark...

    And how to remedy each, according to dermatologists. For premium support please call: 800-290-4726 more ways to reach us

  9. Computer vision syndrome - Wikipedia

    en.wikipedia.org/wiki/Computer_vision_syndrome

    Computer vision syndrome (CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye's muscles being unable to recover from the constant tension required to maintain focus on a close object.

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