How many believe that snow-burn is linked to people with light sensitive eyes?!


Question: How many believe that snow-burn is linked to people with light sensitive eyes? If so why do you feel that way; and if not why do you feel that way?


Answers: How many believe that snow-burn is linked to people with light sensitive eyes? If so why do you feel that way; and if not why do you feel that way?

Photophobia is a symptom of excessive sensitivity to light and the aversion to sunlight or well-lit places. In medical terms it is not fear, but an experience of discomfort or pain to the eyes due to light exposure.

Light sensitivity is usually due to too much light entering the eye, which causes over stimulation of the photoreceptors in the retina and subsequent excessive electric impulses to the optic nerve. This leads to a reflex aversion to light, and discomfort or pain. Too much light can enter the eye if it is damaged, such as with corneal abrasion and retinal damage, or if a pupil(s) is unable to normally constrict (seen with damage to the oculomotor nerve).

Patients with photophobia will avert their eyes from direct light (sunlight and room lights), or may seek the shelter of a dark room or wear sunglasses.

Photophobia is also a behavior demonstrated by insects or other animals which seek to stay out of the light.

Contents [hide]
1 Causes
2 In mythology
3 In fiction
4 See also
5 References
6 External links



[edit] Causes
Patients may develop photophobia as a result of several different medical conditions, related to the eye or the nervous system.

Meningitis
Eye disease, injury, or infection such as chalazion, episcleritis, glaucoma, keratoconus
Subarachnoid haemorrhage
Albinism
Burns to the eye
Migraines
Encephalitis
Conjunctivitis
Aphakia
Iritis
Corneal abrasion
Corneal ulcer
Cataracts
Retinal detachment
Chiari malformation
Cystinosis
Anticholinergic drugs may cause photophobia by paralyzing the iris sphincter muscle.
Hangover
Chikungunya

[edit] In mythology
In folklore and mythology, many creatures suffer from photophobia - or heliophobia, a specific fear of sunlight.

The Norse troll is said to either turn to stone or become trapped above ground when the sun rises.
According to Paracelsus, gnomes explode when they go above ground[citation needed]. As C.S. Lewis puts it, "if he thrust out his face



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