ULTRAVIOLET The invisible part of the light spectrum whose rays have wavelengths shorter than the violet end of the visible spectrum and longer than X rays. UVA and UVB light are harmful to your eyes and skin
Sunglasses serve an important purpose, protecting eyes from the harmful rays produced by the sun. Sunglasses also prevent you from squinting. When you squint you create wrinkels. Also wearing the proper sunglasses will help in the prevention of early cataracts.
When you buy cheap pharmacy sunglasses they do not block out all of the 3 harmful UV rays. there is uv ab and c. UVB rays are the ones that burn the skin and can damage the eyes UVC rays are of little concern as they are absorbed by the upper atmosphere and do not reach the earth's surface UVA are primarily absorbed by your body but over exposure isnt healthy.
PLEASE BUY SUNGLASSES WITH THE PROPER PROTECTION !