Can Cheap Sunglasses be Bad for Your Eyes?
They are cheap and attractive, but from the point of view of health, they can end up costing dearly.
Some sunglasses that are available at street markets not only do not protect the view, but it can increase the damage, it recently warned the Argentine Council of ophthalmology.
The dark glasses create a Camera Obscura that dilates the pupil effect and the lack of filters for ultraviolet rays, end up making the view more affected by UV radiation
To understand this effect, you can “shape of Cup both hands and place on eyes”, explained to the BBC the ophthalmologist Ernesto Ferrer, former President and Advisor to the Executive Committee of the Argentine Council of ophthalmology.
“Open your eyes will take a dark space similar to that produced the non-controlled sunglasses. This produces dilation of both pupils, resulting in greater penetration of ultraviolet light to the interior of the eye.
To Tumors
“Ultraviolet rays affect the skin and logically eyes, producing from a passed to malignant tumors irritation“, said Ferrer.
“In the eye this radiation affects the conjunctiva, causing irritation and tumors; the cornea, lens and even the retina”.
Ferrer said that children should also use proper sunglasses when they are on the beach, in the countryside or wander where it is exposed to ultraviolet radiation.
“Irradiation requires protection to all ages and logically the most sensitive, children and the elderly,” said the bridgat.
In addition, staining the lens, should also be in account are not the same sunglasses for snow than those used for sand because the radiation is different.
Much of the UV rays are filtered by the ozone layer, so that damage to this layer affect the intensity of the radiation that reaches the surface.
UV rays are also also filtered by the atmosphere so radiation increases at higher altitudes.
“Irradiation at the level of the sea than the 5,000 metres above sea level is not the same, and also greater concentration is observed as we get closer to the Ecuador,” said Ferrer.
Understand NM
Ophthalmologist warned that “sunglasses, even if they have not increased, they must be purchased from a perspective because they are specially made with adequate UV light filters”.
Ferrer advised the less sun exposure possible, be attentive to the information of the percentages of UV that is broadcast by the media of communication, use sunscreens of the level indicated in each area and wear Sun glasses obtained in sales of optical products business.
Something fundamental, for the expert, is requesting the necessary guarantees in these shops and demand lenses without aberrations.
What should we look for us to buy sunglasses?
The radiation is measured by its wavelength in nanometers. A nanometre (nm) is a billionth of a millimeter.
Visible light goes about 400 to 700 nm and the UV from 100 to 400.
For man’s eyewear to protect against the most harmful types of ultraviolet radiation, “lenses must have evidence of UVB, UVC, 290-320 nm protection,” said Ferrer.
“The people are unaware the endangerment of the lenses that are sold in public”, warned the ophthalmologist.
“They believe that they do a business but they are severely compromising their view.”