Do you know why your eyes don't get cold?

Have you ever wondered why our eyes not only never get cold, but don’t even feel the cold? They are not covered with wool that could warm them. And the vitreous body, of which the organ of vision consists for the most part, contains 98% water. So what's the matter then?

Well, you have Mother Nature to thank for that. Our eyes are designed so that they can be used in any weather.

Once the American military wanted to know if it was safe to wear lenses during combat operations in cold regions. And in 1982, the biomedical company LinCor Biosciences, at their request, conducted experimentto understand whether these products can “freeze” to the eye.

The experiments were carried out on rabbits. They were put on contact lenses and exposed to wind speeds of up to 125 km/h for 3 hours. The air temperature was −28.9 °C. Poor animals in the end were subjected to cooling down to −67.8 °C! But none of them lost their vision and none of their lenses froze to their eyes. The experimental subjects experienced only mild

redness, disappeared after a couple of hours.

Marine biologist from the University of Wales and polar explorer David Thomas in his book Survival in Antarctica writesthat sustainability eye to frost is explained by their location. That is, because they are - suddenly - in your head. And it maintains a temperature of about 36.5–37 °C, as in the whole body. Therefore, the eyes never cool enough to freeze.

Add also that the eyes are constantly wash themselves tears, and their production intensifies in the cold. They consist mainly of water, but also contain a lot of salt, which lowers the freezing point. This allows our visual organs to remain hydrated even in the cold.

In addition, the cornea is the most protruding transparent part of the eye that refracts light - few susceptible to frostbite. The fact is that there are no blood vessels in it. And the space between her and iris, which is called the anterior chamber, is filled with aqueous humor (lat. humor aquosus). And it also nourishes the cornea.

In 2014, scientists from Oslo University Hospital conducted study, freezing donor corneas with liquid nitrogen to −40 °C. And they found that aqueous humor, consisting of water, electrolytes and amino acids, due to its composition, ensures a constant temperature of the eyes - about 37 ° C.

Does this mean that they are completely invulnerable to the cold? No, low temperatures may call dryness and rapid evaporation tear fluid. And if you endure this for a long time, you can develop serious vision problems.

In addition, the already mentioned cornea, when exposed to strong winds and cold, may for a short time freeze, which is fraught with abrasion. This condition is accompanied by severe discomfort, redness of the eyes, watery eyes and sensitivity to light. Marathon runners and rock climbers who neglect protective glasses suffer from corneal abrasion.

But if you use drops to moisturize and stay hydrated, and cover your eyes from the wind, you have nothing to fear even on the coldest days.

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