Look for the `UV100′ tag on any pair of sunglasses you buy. It’s your guarantee that your eyes are protected from the premature ageing caused by ultraviolet rays.
Fewer than half of the sunglasses on the market have adequate protection from ultraviolet light, so you have to be careful.
Many people think that dark glasses provide protection — and the darker, the better. But dark lenses without UV coating may be more dangerous to your eyes than wearing no sunglasses at all. Dark glasses cause your pupils to dilate. And with your pupils opened more widely, you’re likely to receive an even larger dose of ultraviolet radiation than if you weren’t wearing sunglasses at all.
Colour counts for more than looks in sunglasses. You may want to choose blue shades because they are in fashion or look more stylish, but they can be dangerous.
According to an eye specialist at the Manhattan Eye, Ear and Throat Hospital in New York City, you are better off with lenses that are tinted yellow or amber. These lenses are more protection of your eyes because they transmit yellow light, which is less damaging than the blue light transmitted by blue lenses.
Grey is a popular neutral tint that allows eyes to perceive colours in their purest form and reduce brightness and glare. Brown tinted glasses heighten contrast and visual acuity, while blocking blue light.
Good lenses don’t need to be expensive. You can pick up one in consultation with the doctor. Take sunglasses that will provide effective protection against damaging rays.