Computer Vision Syndrome (CVS)
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Eyeglass Coatings

Modern technology has developed various types of eyeglass coatings that can be applied to the lenses to perform certain important functions such as:

1. Scratch resistance coating - Plastic lenses are very popular because they are much lighter than glass and are virtually unbreakable. Because they are softer than glass, they scratch much more easily if they come in contact with a harder substance. Now they can be coated with a clear substance that when it dries is nearly as hard as glass making them much more scratch resistant.

2. Anti-reflective coating - All lenses will reflect some light from both the front and back lens surfaces. A tint can be applied to remove nearly all of these reflections. If the layer thickness is precisely controlled so that it is exactly one-quarter of the wavelength of the light, it thereby forms a quarter-wave coating. The incident beam, when reflected from the second interface, will travel exactly half its own wavelength further than the beam reflected from the first surface. If the the two beams have intensities that are equal, then since they are out of phase from each other, they will destructively interfere and cancel each other out with no reflection from either surface.

3. Sunglass coatings - In cases were the sunglass color is throughout the lens material, the prescription creates a lens that has a graduation in color. The thickest part of the lens would be darker than the thinner part. A color coating can be applied to the surface of a clear lens that would result in an even coloration no matter what the strength of the prescription might be.

4. Anti-ultraviolet coating - This kind of coating can be applied to the lens surface to increase the protection from the sun's ultraviolet radiation by absorbing these harmful rays.

Eyeglass coatings are cost effective and very beneficial.