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Sunglasses are tinted to reduce the amount of light that reaches you eye, but various colours of tinting produce different overall effects on the way you see the world. Some shades will enhance contrast while others reduce glare, reduce eye stress or simply look classy. Knowing a bit about tinting will help you in selecting a great pair of sunglasses that fit your specific needs.

Please note that there are various degrees of tinting, regardless of shade. The degree of tint indicated what percentage of light penetrates the lens and reaches your eye. For example, a tint of 80-100% means roughly 80-100% of the light will reach your eye. On the inverse, a tinting of 45% means more than half of the light will be blocked. It is dangerous to drive with a tinting of over 60%, and such extreme tinting is usually reserved for extreme sun exposure- like skiing the Saharan dunes in July. The best option is to get a pair that works for you, but does not block too much light that your safety is in danger.

Yellow tinted sunglasses help increase contract and depth perception. Meaning, in poor or scattered light yellow and brown lenses will help you see distances with greater clarity due to enhanced contrast. This is why many hunters and other riflemen use this tinting shade. Hunters need to be able to distinguish a deer in light brown from the surrounding brown and green woods—increased contrast helps the hunter more easily spot an aberration. Practitioners of winter sports also wear yellow tinted goggles because they increase the contrast on the ice, making it easier to see slight bumps or ridges on the snow or ice.

Similarly, brown tinting helps to reduce glare, and is best in hazy sunshine. For this reason, brown tinted glasses are popular in water sports, where glare is a performance factor. Brown is also popular for skiers of summer slopes, where glare on the snow and ice can be hazardous and blinding.

Green is generally used to reduce eyestrain under bright lights, which is why accountants (stuck under fluorescent lights all day) wore neon green plastic visors. Green provides semi-enhances contrast in low light, though nothing matching the contrasting power of yellow-tinted lenses. One should use green tinted sunglasses if he or she plans to be under extremely bright light, or if the person gets reoccurring headaches induced from light.

Grey and black tinting does not add anything spectacular in the way of enhanced contrast, glare-reduction or eye comfort. However, these shades do tend to allow less light through the lens, and are thus somewhat more useful in terms of overall light reduction.

            Purple and blue tints are mainly cosmetic, and provide no additional enhancement and indeed block very little light. In fact, they very rarely block UV rays and such a large amount of light can penetrate through them that they are hardly worth wearing unless for a fashion statement. However, they do look extremely cool, and are suitable for wearing indoors, so they do have their place in the wide world of tinting.

            Red tinted lenses are sometimes used by riflemen and the military because your eyes adjust most quickly between normal light and red light. Thus, flashlights used at night by the military are often red (which shows up less in night vision goggles). Red lenses are advisable for people in normal but not extreme light conditions who will need to switch between wearing and removing the glasses often, for example, fishing on a hazy day where you have to remove your glasses quickly when you net a resistant fish.

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