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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.
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 ...
The Sinai insurgency was an insurgency in the Sinai Peninsula of Egypt, launched by Islamist militants against Egyptian security forces, which also included attacks on civilians. [44] The insurgency began during the Egyptian Crisis, during which the longtime Egyptian president Hosni Mubarak was overthrown in the 2011 Egyptian revolution. [45]
“We should not get too much bright light in the evening, which means we should all have blue light filters on our devices. We should, if possible, not use devices anymore after 6 p.m. that much ...
Other medical conditions such as keratoconus (an eye disorder that results in extreme optic sensitivity to sunlight and bright lights), migraine which can be triggered by bright light, and porphyria cutanea tarda, which causes the skin to be overly sensitive to sunlight to the point of causing blisters, can result in heliophobia if the sufferer ...
Again, the link between light pollution and Alzheimer’s disease is a newer one that needs to be explored more. But lowering your exposure to light could help you sleep better, now and in the future.
Humans are sensitive to light with a short wavelength. Specifically, melanopsin is sensitive to blue light with a wavelength of approximately 480 nm. [19] The effect this wavelength of light has on melanopsin leads to physiological responses such as the suppression of melatonin production, increased alertness, and alterations to the circadian ...
People with protanopia have essentially no sensitivity to light of wavelengths more than 670 nm. Most non-primate mammals have the same luminous efficiency function as people with protanopia. Their insensitivity to long-wavelength red light makes it possible to use such illumination while studying the nocturnal life of animals. [18]