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  2. Non-24-hour sleep–wake disorder - Wikipedia

    en.wikipedia.org/wiki/Non-24-hour_sleep–wake...

    The possible causes of non-24-hour sleep-wake disorder are 2-fold: (1), extrinsic: isolation from daily light cycles (such as working in an environment completely devoid of natural lighting); [citation needed] and (2), intrinsic: where some condition, such as blindness or malfunctioning biochemical response to light in the subject, prevent ...

  3. Visual snow syndrome - Wikipedia

    en.wikipedia.org/wiki/Visual_snow_syndrome

    Eye pathologies or other neurological conditions can also be a cause of visual anomalies, including the appearance of visual static or other changes in perception. Additionally, psychological disorders, such as somatic disorders , could potentially contribute to these perceptual disturbances.

  4. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Eye injuries, most often occurring in people under 30, are the leading cause of monocular blindness (vision loss in one eye) throughout the United States. Injuries and cataracts affect the eye itself, while abnormalities such as optic nerve hypoplasia affect the nerve bundle that sends signals from the eye to the back of the brain, which can ...

  5. Why astigmatism causes blurry vision, especially at night - AOL

    www.aol.com/news/why-astigmatism-causes-blurry...

    Astigmatism, a disorder that affects how the eyes focus light, can be exacerbated at night. Blurry vision and headaches are symptoms of astigmatism. Why astigmatism causes blurry vision ...

  6. What To Know if You're Constantly Getting Headaches ... - AOL

    www.aol.com/know-youre-constantly-getting...

    Related: 6 Most Common Types of Headaches. What Headaches Behind Your Eyes Mean, According to Neurologists. There can be several causes of headaches behind your eyes. They include: Vision and eye ...

  7. Computer vision syndrome - Wikipedia

    en.wikipedia.org/wiki/Computer_vision_syndrome

    Some symptoms of CVS include headaches, blurred vision, neck pain, fatigue, eye strain, [1] dry eyes, irritated eyes, double vision, vertigo/dizziness, polyopia, and difficulty refocusing the eyes. These symptoms can be further aggravated by improper lighting conditions (i.e. glare, [2] [3] strong blue-spectrum backlights, [citation needed] or ...

  8. Why Am I Waking Up with Headaches? A Sleep Expert Helps Us ...

    www.aol.com/lifestyle/why-am-waking-headaches...

    You slept eight luxurious hours last night (or, you know, at least six). But as soon as you sat up in bed this morning, you noticed it. The throbbing temples. The pounding at the base of your skull.

  9. Retinal migraine - Wikipedia

    en.wikipedia.org/wiki/Retinal_migraine

    Retinal migraine is a retinal disease often accompanied by migraine headache and typically affects only one eye. It is caused by ischaemia or vascular spasm in or behind the affected eye. The terms "retinal migraine" and "ocular migraine" are often confused with " visual migraine ", which is a far-more-common symptom of vision loss, resulting ...