How motorists ruin their eyesight in the summer with “driver’s” sunglasses
The bright sunny weather, typical for the summer months, simply forces us to use protective sunglasses. The paradox is that the use of many of them does much more harm than good.
On the Internet and on the shelves of offline stores with the onset of the summer season, a lot of “spectacle” offers for every taste appear. Most of us do not really bother with their choice. When buying, they look in the mirror (how the accessory “fits the face”), check with the seller or in the description for the presence of polarization, purchase the item and then happily wear it in bright weather. Some of us have heard that in the solar spectrum there is ultraviolet radiation that is practically invisible to the eye – a set of electromagnetic waves shorter than 380-400 nm.
We do not perceive them with our eyes, but they are quite capable of influencing the cells of our body. Sometimes it is “thanks” to them that in the summer you can get badly burned even when the Sun is closed from us by a thin veil of clouds and does not seem to shine brightly.
What happens when the driver wears regular dark glasses? To begin with, we recall that lenses with a fairly low light transmission value are most often used for driving glasses – at the level of 8-18%. “Driver glasses” are usually gray, black or brown. Yellow ones are not of interest to us now, since they are intended for cloudy weather. When we look through dark lenses at the sun-drenched world, the pupil of our eye, receiving a dose of light reduced by glasses, automatically expands so that the retina perceives it in sufficient quantity to perceive reality.
But the “ambush” is that the ultraviolet, which was mentioned above, our eyes practically do not feel at all. And therefore this light wave is poured into the open pupil in a powerful stream. Without glasses, we would squint, and the pupil would shrink to the size of a pinhead and would not let in an excessive dose of UV radiation. But in “sunglasses” it freely and imperceptibly burns out our retina. For the driver, the situation is aggravated by the fact that he is forced to stare at the road for a long time, receiving an ultraviolet “overdose” with his eyes.
Not only does it lead to fatigue. Over time, ultraviolet burn leads to macular degeneration of the retina, which is expressed in blurred vision. Excess UV also provokes the development of cataracts and even oncology. And all this thanks to the usual sunglasses. Therefore, when you drive a car, the choice should be made exclusively among products that are labeled “400-UV”. This means that such glasses do not transmit radiation with a wavelength shorter than 400 nm. That is, they block all ultraviolet radiation. In a situation where it is not possible to purchase a “four hundred”, choose those “eyepieces” whose outer side of the lenses gives a strong blue-violet reflection. And the inside is a normal gray or black color. This allows you to count on the fact that they reflect the blue-violet part of the solar spectrum well and protect your eyes from insidious radiation.
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