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  2. Omen - Wikipedia

    en.wikipedia.org/wiki/Omen

    Explanations in English were added to this manuscript by a nineteenth-century American missionary. [ 1] An omen (also called portent) is a phenomenon that is believed to foretell the future, often signifying the advent of change. [ 2] It was commonly believed in ancient times, and still believed by some today, that omens bring divine messages ...

  3. Macular degeneration - Wikipedia

    en.wikipedia.org/wiki/Macular_degeneration

    8.7% global prevalence in 2020 [ 2] Macular degeneration, also known as age-related macular degeneration ( AMD or ARMD ), is a medical condition which may result in blurred or no vision in the center of the visual field. [ 1] Early on there are often no symptoms. [ 1] Over time, however, some people experience a gradual worsening of vision that ...

  4. Onan - Wikipedia

    en.wikipedia.org/wiki/Onan

    He wrote his Thoughts on the Sin of Onan (1767), which was reproduced as A Word to Whom it May Concern on 1779, as an attempt to censor a work by Samuel-Auguste Tissot. [36] In that writing, Wesley warned about "the dangers of self pollution", the bad physical and mental effects of masturbation, [ 37 ] [ 36 ] writes many such cases along with ...

  5. Computer vision syndrome - Wikipedia

    en.wikipedia.org/wiki/Computer_vision_syndrome

    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.

  6. Retinal scan - Wikipedia

    en.wikipedia.org/wiki/Retinal_scan

    Retinal scan. A retinal scan is a biometric technique that uses unique patterns on a person's retina blood vessels. It is not to be confused with other ocular-based technologies: iris recognition, commonly called an "iris scan", and eye vein verification that uses scleral veins.

  7. Rheum - Wikipedia

    en.wikipedia.org/wiki/Rheum

    Rheum from a cat's eyes. Rheum ( / ruːm /; from Greek: ῥεῦμα rheuma 'a flowing, rheum') is a thin mucus naturally discharged from the eyes, nose, or mouth, often during sleep (contrast with mucopurulent discharge ). [ 1][ 2][ 3] Rheum dries and gathers as a crust in the corners of the eyes or the mouth, on the eyelids, or under the nose ...

  8. Keratoconus - Wikipedia

    en.wikipedia.org/wiki/Keratoconus

    Keratoconus. Keratoconus ( KC) is a disorder of the eye that results in progressive thinning of the cornea. [ 3] This may result in blurry vision, double vision, nearsightedness, irregular astigmatism, [ 4] and light sensitivity leading to poor quality-of-life. [ 3][ 5] Usually both eyes are affected. [ 3] In more severe cases a scarring or a ...

  9. Eye strain - Wikipedia

    en.wikipedia.org/wiki/Eye_strain

    Eye strain, also known as asthenopia (from Greek a-sthen-opia, Ancient Greek: ἀσθενωπία, transl. weak-eye-condition ), is a common eye condition that manifests through non-specific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache, and occasional double vision. [ 1] Symptoms often occur after long-term use ...