the cheap sunglasses can cause double vision or headaches to those who wear them.
According to a survey conducted by British consumer protection group, found that even those glasses with little price difference from the designer or those sold at opticians, failed to pass the aptitude test they were, making them ineligible for use.
Similarly, spectacles with low price and bought from a kiosk, shop or other itinerant, can cause deterioration in the quality of light entering the eye lens, resulting in double vision or headaches in some of their users.
It has been found that such glasses, often have one lens different from another, and some sunglasses leave different amounts of light to pass to each eye.
Nevertheless, the problems presented could not cause long term damage to vision users, but certainly the "side effects" that cause is neither desirable nor pleasant. Of course, you must know that continued use of such lenses, speed-somehow-the development of eye disease.
For these reasons it is preferable to buying glasses, whether visually, or sunglasses, be made from optical shops, which have the appropriate expertise to build good lenses.
Better late then one can change the frame and is "out of fashion ', rather than exacerbate or cause new health problems.
