What do you need to know?
- Snow blindness is a temporary but painful corneal burn caused by excess UV radiation, especially in mountainous conditions.
- Objawy to m.in. silny ból oczu, łzawienie, światłowstręt i uczucie piasku pod powiekami – pojawiają się zwykle po kilku godzinach od ekspozycji.
- Treatment consists of resting the eyes in a dark room, cold compresses and avoiding further exposure to light - usually the discomfort passes in 24-48 hours.
- To prevent snow blindness, wear sunglasses with UV filters (preferably with side shields) and avoid intense radiation, especially on snow or ice.
Snow blindness is a temporary but painful eye condition caused by excessive exposure to ultraviolet (UV) radiation. This phenomenon most often occurs in high mountainous conditions, where UV rays reflecting off the snow significantly increase in intensity.
Jest to rodzaj fotokeratitis, czyli oparzenia rogówki oka. Często dotyka osób przebywających na śniegu lub lodzie, zwłaszcza tych, które nie chronią swoich oczu okularami przeciwsłonecznymi wyposażonymi w filtr UV. Charakterystycznymi objawami ślepoty śnieżnej są łzawienie oczu, zaczerwienienie oczu, silny ból oczu oraz uczucie piasku w oczach. W skrajnych przypadkach może wystąpić tymczasowa utrata wzroku.
Adequate eye protection, especially in the mountains, is key to preventing snow blindness. Wearing sunglasses and avoiding prolonged exposure of the eyes to intense UV radiation can protect against this painful condition.
What is snow blindness?
Snow blindness is a burn of the corneal epithelium caused by overexposure to ultraviolet (UV) radiation. Its symptoms include inter alia. watery eyes, a feeling of sand under the eyelids, eye pain and photophobia. Snow blindness exacerbates these symptoms especially in situations where sun exposure is intense and eye protection is inadequate.
The causes of snow blindness are related to the reflection of UV rays from surfaces such as snow, ice or sand. In the mountains, at high altitudes, UV radiation becomes more intense, which further increases the risk of eye damage. In such situations, adequate eye protection, such as wearing sunglasses with UV filters, is crucial.
If symptoms of snow blindness occur, apply cold compresses, avoid bright light (e.g. stay in a dark room) and possibly reach for painkillers. Symptoms usually pass after 24-48 hours if the eyes are properly protected.1
How does snow blindness develop in humans?
Snow blindness is caused by exposure to intense ultraviolet (UV) radiation, which damages the epithelium of the cornea and conjunctiva of the eye. The sun's rays, reflecting off bright surfaces such as snow, ice or sand, increase the intensity of UV radiation, leading to photochemical damage to the tissues of the eye. In high-altitude conditions, UV levels increase with altitude - for every 1,000 metres, the intensity increases by about 10-12%.
Symptoms of snow blindness usually appear a few hours after exposure and include severe eye pain, tearing, a feeling of sand under the eyelids and photophobia. Sometimes they are also accompanied by a severe headache.
Wearing sunglasses with UV filters is the primary preventive measure. Prevention of snow blindness also includes avoiding prolonged exposure to sunlight, especially in the mountains where UV radiation reaches its maximum intensity.
How does blindness begin?
Snow blindness begins with unconscious exposure of the eyes to intense ultraviolet (UV) radiation. Ultraviolet rays damage the corneal epithelium, leading to the development of symptoms within hours of exposure. The first symptoms are discomfort, photophobia and watery eyes. Over time, eyelid spasm, a feeling of sand under the eyelids and snow blindness typical symptoms such as eye pain and blurred vision also appear.
UV radiation in the mountains and reflections from the snow intensify the negative effects on eye tissues. In the absence of adequate eye protection - e.g. wearing UV-filtered sunglasses - the discomfort can intensify, leading to temporary visual impairment.
It is crucial to protect the eyes from ultraviolet radiation by using preventive measures such as sunglasses and limiting the time spent in the sun under conditions of high UV radiation.
Is snow blindness passing?
Yes, snow blindness usually passes spontaneously within 24-48 hours if the eyes are given adequate rest and protection from further exposure to ultraviolet (UV) radiation. It is a temporary damage to the cornea and conjunctiva which, although painful, does not usually lead to permanent damage.
During regeneration, there may be discomfort when moving the eyes, tearing and photophobia. In some cases there are swollen eyelids and symptoms of conjunctival burning. The key is to stay in a dark room and avoid bright light to minimise symptoms.
For a full recovery of normal vision, it is important to avoid further exposure to UV radiation, especially in the mountains where UV radiation is particularly intense. If symptoms persist for more than two days or become very bothersome, an ophthalmologist should be consulted.
Ważne pytania i odpowiedzi
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No, snow blindness can occur not only in mountains, but wherever UV radiation is intense and its reflections off bright surfaces such as snow, sand or water increase its intensity. Mountains, however, are a particularly risky environment due to the higher UV intensity at high altitudes.
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Yes, children are also at risk of snow blindness, especially if they spend time in conditions of intense UV radiation and their eyes are not adequately protected. It is worth taking care of UV-filtered sunglasses for the little ones too.
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No, bright light, including headlights and computer screens, should be avoided during snow blindness symptoms. It is best to stay in a dark room to minimise discomfort and aid eye recovery.
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Sunglasses with UV filters are an essential preventative measure, but it is best to choose models with side shields to protect your eyes from reflected light. In extreme conditions, such as on glaciers, it is advisable to use specialised ski goggles with UV filters.
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Usually, snow blindness is temporary and resolves without permanent damage. However, repeated UV exposure can lead to more serious eye problems, such as cataracts or permanent corneal damage. Therefore, eye protection is crucial.
