quote:
[b]sneeuwblindheid? nooit van gehoord ff googlen:D
Ik ging toen smiddags skieen. Daarna nog nergens last van. Snachts werd ik plotseling wakker mijn pijn in de ogen, een erg brandering gevoel. Verder kon ik toen tijdelijk niet meer in een lichte omgeving kijken.
Meer info:
http://www.umm.edu/outdoor/snow_blindness.htmquote:
Exposure to ultraviolet radiation (UVR) from the sun can lead to a “sunburn” of the cornea (clear surface of the eye). This occurs when proper precautions are not used at high altitudes, where a greater amount of unfiltered (by the atmosphere) ultraviolet radiation is present; the exposure may be compounded by reflection from the snow. The intensity of ultraviolet energy increases by a factor of 4% to 6% for every 1,000 foot (305 meter) increase in altitude above sea level. Snow reflects 85% of ultraviolet B (UVB, the culprit wavelengths that cause snow blindness); dry sand reflects 17%, while grass or sandy turf reflects 2.5%. Water may reflect 10% to 30% of ultraviolet B, depending upon the time of day and location.
The cornea absorbs ultraviolet radiation below 300 nanometers, which includes a fair portion of UVB. Radiation of wavelengths longer than 300 nanometers is transmitted to the lens and, over time, can cause cataracts.
High exposure to UVB can cause a corneal burn within one hour, although symptoms may not become apparent for six to 12 hours. Symptoms include excessive tearing, pain, redness, swollen eyelids, pain when looking at light, headache, a gritty sensation in the eyes, and decreased (hazy) vision. Similar symptoms occur when the surface of the eye is physically scratched (corneal abrasion). Treatment consists of patching the eye closed after instilling a few drops of ophthalmic antibiotic solution (such as sodium sulamyd 10%, or gentamicin), because the surface of the cornea will regenerate spontaneously in 24 to 48 hours. It is important to check the eye first for a foreign body. After patching, the eye must be rechecked in 24 hours. If the eye appears infected with pus, then it should be left unpatched; administer a topical antibiotic solution three to four times a day, and have the victim wear sunglasses. Pain medicine should be used as appropriate. If both eyes are involved, then only the more severely affected eye should be patched, so that the victim can continue to make his way.