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  2. Photophobia - Wikipedia

    en.wikipedia.org/wiki/Photophobia

    Photophobia is a medical symptom of abnormal intolerance to visual perception of light. [1] As a medical symptom, photophobia is not a morbid fear or phobia, but an experience of discomfort or pain to the eyes due to light exposure or by presence of actual physical sensitivity of the eyes, [2] though the term is sometimes additionally applied to abnormal or irrational fear of light, such as ...

  3. Purkinje effect - Wikipedia

    en.wikipedia.org/wiki/Purkinje_effect

    The sensitivity to light in scotopic vision varies with wavelength, though the perception is essentially black-and-white. The Purkinje shift is the relation between the absorption maximum of rhodopsin , reaching a maximum at about 500 nanometres (2.0 × 10 −5 in), and that of the opsins in the longer-wavelength cones that dominate in photopic ...

  4. Light effects on circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Light_effects_on_circadian...

    Artificial light at night causing circadian disruption additionally impacts sex steroid production. Increased levels of progestogens and androgens was found in night shift workers as compared to "working hour" workers. [21] The proper exposure to light has become an accepted way to alleviate some of the effects of seasonal affective disorder ...

  5. “Exposure to light at night is a completely unnatural and alien experience,” Steven Lockley, a neuroscientist at Harvard Medical School’s Division of Sleep Medicine, said in author Paul ...

  6. Light exposure during the day linked to a 20% lower risk of ...

    www.aol.com/lifestyle/light-exposure-during-day...

    Exposure to light at night, particularly blue light that can be emitted from phones and other screens, can make it harder to get to sleep, Jaime Zuckerman, a clinical psychologist specializing in ...

  7. Photosensitivity in humans - Wikipedia

    en.wikipedia.org/wiki/Photosensitivity_in_humans

    Light sensitivity or photosensitivity refers to a notable or increased reactivity to light. Apart from vision , human beings have many physiological and psychological responses to light. In rare individuals an atypical response may result in serious discomfort, disease, or injury.

  8. Reducing night light exposure may be a simple way to cut ...

    www.aol.com/reducing-night-light-exposure-may...

    Scientists believe that avoiding bright light at night may be a cheap and easy way to possibly delay or prevent the development of type 2 diabetes. Over the last few years, research has shown that ...

  9. Rod cell - Wikipedia

    en.wikipedia.org/wiki/Rod_cell

    A rod cell is sensitive enough to respond to a single photon of light [11] and is about 100 times more sensitive to a single photon than cones. Since rods require less light to function than cones, they are the primary source of visual information at night (scotopic vision). Cone cells, on the other hand, require tens to hundreds of photons to ...