Diseases of travelers (snow blindness)

Diseases of travelers (snow blindness)Diseases of travelers (snow blindness) Snow blindness, or snow ophthalmia, is a kind of burns of the conjunctiva and cornea with ultraviolet rays of the sun reflected from the snow crystals. Especially often it occurs in the spring, in the period of "Aurora snow", when the reflectivity of the snow cover increases. First, You will cease to distinguish the difference between the levels of the surface, then in the eyes of the feeling, as if under the eyelids fell fine sand. By the evening the pain become unbearable. Eyes inflamed, swollen eyelids, and people really fades, becoming surprisingly helpless. Were treated in the past ophthalmia: compresses, the alcoholic tincture of opium, even snuff. During high-latitude expeditions successfully apply 10-20% solution sulfacetamide, burying his daily 1-2 drops in each eye. To ensure OFTAL are also solutions of 0.25% zinc sulfate, 1% solution of protargol. However, in terms of Autonomous existence, when drugs may be missing the most reliable tool is the darkness. One or two days stay in the shelter or in the dark, opaque bandage is enough for a complete cure. To ease the pain, you can use cold lotions. It is important to remember that this disease does not confer immunity and negligence may be repeated as many times as people would react derogatory to the rule to wear glasses-filters. After radiation it for a long time remains predisposed to this disease. Paradoxically, but on a cloudy day the risk of Contracting the snow ophthalmia significantly higher than in the sun. The answer is that on a cloudy day because the ambient light all around is equally white and the sky and the snow and ice. Hills and snowy ledges, even large ones, do not cast shadows and become indistinguishable. To avoid an obstacle or not to fall into the pit, it is necessary to strain the eyes. Thus the eye is deprived of the natural protective mechanism in bright sunlight limits the ingress of the reflected ultraviolet light. The surest means of preventing the disease - glasses-filters. However, the opinions of experts about the color of the glasses apart. Maybe, it is explained how the glass of this or that color was allowed to work, to move, to conduct surveillance. Most researchers of the Arctic and Antarctic prefer points smoky color. Smoky glasses have a significant advantage: reducing the brightness of the lighting, they do not change the perception of surrounding objects. Source:.



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