Some prescription eyeglasses are tinted with a wide variety of colors and shades. The purpose of tint is to reduce glare from certain situations: such as bright lights, computers television sets, etc. Another reason for tinting of lenses are to offer comfort to eyes. Also, people order tints on their eyeglasses for fashion.

Glass and most plastic lenses are coated with a UV protection coating. Ultra violet rays can cause severe damage to eyes. It is very important to protect your eyes while out in sun.

Another coating that is added to a pair of prescription eyeglasses is scratch-resistant coating. Sometimes this coating is applied at manufacturer and other times it can be added right there at eye doctors office. It must be said, however, that even while this coating can aid in durability of lens, it does not make lens scratch proof.

Sunglasses come in non-prescription and prescription sunglasses. They both benefit eye by protecting them from sun. The tint on a pair of sunglasses is irrelevant to protection that it offers.

Children as well as adults should wear sunglasses. The ultra violet damage occurs over time, therefore, a person needs to protect eyes at an early age. Also children's eyes are more sensitive that that of an adult. The bottom line is that while wearing sunglasses is a fashion statement, they have a specific function-to protect your eyes from sunlight.