The use of cheap sunglasses does not always impair vision because almost all types of glasses, even those without a known brand, that are sold in clothing stores, for example, have effective protection against the ultraviolet rays that burn the eyes, just as with the skin.
However, sunglasses that are excessively cheap, such as those sold on street vendors, are very low quality and therefore in most cases have very low or no UVA and UVB protection, which most affects vision than when nothing is used.
Learn about the 7 benefits of polarized lens sunglasses.
Because poor quality glasses can impair vision
Glasses that do not have adequate protection only reduce the amount of light that passes through the lens to produce an effect similar to normal glasses and allow you to open your eyes on the street when walking in the sun.
But by reducing only the light that passes through the lenses, the glasses require the pupil of the eyes to dilate so that one can see correctly "in the dark." This causes a greater amount of UV rays to be absorbed by the dilated eye, making the vision worse than not using glasses.
How To Choose The Right Sunglasses
Because ultraviolet light is invisible, it is not possible to know if it is passing the lens of the glasses and, therefore, it is not true that darker lenses protect better than the lighter ones.
Thus, to choose the safest sunglasses it is recommended to buy reference brands like Ray-Ban, Chilli Beans or Lumpa Lumpa because they have quality standards that always guarantee glasses with the correct protection.
However, if you choose to buy other brands it is important to note if they have the seal of approval against UVB and UVA radiation.
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