Scratch Resistant Coating (SRC):
This treatment is a silicone resin coating applied by either the lens manufacturer, or the lab, to increase the scratch resistance of the lens surface, which may be added to plastic or high index lenses. Polycarbonate and progressive lenses usually include scratch resistant coating.
Tint and Colors:
Glass and plastic lenses can be tinted in a wide variety of colors, ranging from fashion tints to dark sun-glass tints. Glass lenses are limited in the range of intensities and colors. They are generally used with sun-glass tints. Tinting for cosmetic purposes is usually applied to plastic lenses.
Plastic lenses are tinted by immersing them in special dyes. The dye is absorbed by the plastic, thus coloring the lens. Specific colors can serve specific purposes.
The percentage of a tint may vary from very light to very dark and is available in solid gradient, fashions gradient, and double gradient.
Coloration equally applied to the entire surface of the lens and may vary from very light (3%) to very dark (85%).
Same as a solid tint, however coloring is darkest on the top of the lens and fades to almost non-existent level on the bottom of the lens, or may have a different color applied to the bottom half.
Glass lenses are tinted by adding metallic substances to the glass itself during its manufacture or by coating the lenses. When in the order entry system, the tint on glass lenses is referred to as color. The coating process will take from 3 to 5 days in the lab. The colors labeled Grey 3, Pink 1, and Pink 2 are tinted during the manufacturing of the glass, therefore, are most likely available for immediate processing when you order your eyeglasses. Grey 3 also includes UV protective coating.
Standard glass lenses are available in three different percentages of opaqueness: 20%, 40%, and 70% and sometimes are known respectively 1, 2, and 3 when an optometrist or ophthalmologist places an order for them.
Anti-Reflective Coating (ARC):
This is a clear magnesium fluoride coating, applied to both sides of lens, limits light reflection by allowing the maximum amount of light through the lens. There is usually a 1-year warranty against peeling with most manufacturers. ARC is effective for reducing headlight glare and helps reduce eye strain when using a video display terminal or better known as a computer monitor. These lenses appear cosmetically more pleasing in a pair of eyeglasses. ARC may cause the lens to have a faint green or blue appearance. Original coatings are a single layer on each side. New coatings are 5 layers on each side. Lenses with ARC are more difficult to clean (from “smudging”).
Ultraviolet is a coating, which is applied to block the sun’s ultraviolet rays. Transition plus, Transition III and Polycarbonate Photogrey Extra lenses include UV coating. UV may be applied to any other lens type. This coating will screen up to 99.9% of ultraviolet rays.
Mirror coating is a coating that is applied to the front of the lens, which reflects light, causing the appearance of a mirror.