Lens coatings

Various coatings on lenses are used to avoid unwanted reflections, glare and excess sunlight.

Only in the last century has attention been drawn on the fact that spectacles can do more than just correcting vision. Various coatings are used to avoid unwanted reflections, glare and excess sunlight.

Here are some of the coatings for spectacles that are very effective and increase vision comfort.

Anti-reflective coatings: Also called multiple coatings, these give clear vision by cutting out unwanted reflections. They also improve appearance by letting people see more of your eye rather than reflection bouncing off from your glasses.

U-V coatings: U-v coatings protect you from a portion of the u-v radiation that can damage your eyes. It would be advisable to buy sunglasses that also have a u-v coating.

Scratch resistant coatings: The main drawback with plastic lenses seems to be their low scratch resistance. The durability of plastic lenses can be increased with scratch resistant coatings, preferably on both sides of the lens.

Photochromatic lenses: Apart from the many disadvantages spectacles wearers suffered in the past, one was that they could never wear sun glasses.

Ever since the arrival of photochromatic, or light sensitive glasses, the possibility of power glasses also serving as sun glasses opened up. Today’s photochromatic lenses can darken in bright light and automatically lighten when the user is indoors. Many cosmetic tints are also available.(Source: Webhealthcentre.com)