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  2. Cataract - Wikipedia

    en.wikipedia.org/wiki/Cataract

    A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision of the eye. [1] [7] Cataracts often develop slowly and can affect one or both eyes. [1] Symptoms may include faded colours, blurry or double vision, halos around light, trouble with bright lights, and difficulty seeing at night. [1]

  3. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    The most common causes of visual impairment globally are uncorrected refractive errors (43%), cataracts (33%), and glaucoma (2%). [1] Refractive errors include near-sightedness, far-sightedness, presbyopia, and astigmatism. [1] Cataracts are the most common cause of blindness. [1]

  4. Oxygen toxicity - Wikipedia

    en.wikipedia.org/wiki/Oxygen_toxicity

    Central nervous system oxygen toxicity manifests as symptoms such as visual changes (especially tunnel vision ), ringing in the ears ( tinnitus ), nausea, twitching (especially of the face), behavioural changes (irritability, anxiety, confusion), and dizziness.

  5. Retinitis pigmentosa - Wikipedia

    en.wikipedia.org/wiki/Retinitis_pigmentosa

    Retinitis pigmentosa ( RP) is a genetic disorder of the eyes that causes loss of vision. [1] Symptoms include trouble seeing at night and decreasing peripheral vision (side and upper or lower visual field). [1] As peripheral vision worsens, people may experience "tunnel vision". [1]

  6. List of bad luck signs - Wikipedia

    en.wikipedia.org/wiki/List_of_bad_luck_signs

    Bad luck is an unpredictable outcome that is unfortunate. This is a list of signs believed to bring bad luck according to superstitions. List. Breaking a mirror is said to bring seven years of bad luck; A bird or flock of birds going from left to right [citation needed] Certain numbers: The number 4.

  7. Methanol toxicity - Wikipedia

    en.wikipedia.org/wiki/Methanol_toxicity

    Symptoms may include a decreased level of consciousness, poor or no coordination, vomiting, abdominal pain, and a specific smell on the breath. [1] [2] Decreased vision may start as early as twelve hours after exposure. [2] Long-term outcomes may include blindness and kidney failure. [1]

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