There are several coatings that can be applied to lenses to improve vision and performance. Scratch-resistant coatings protect the surface of plastic and polycarbonate lenses. Anti-reflective coatings reduce glare by decreasing the reflection of light off the lens surface. Anti-fog coatings prevent moisture from forming on the inside of lenses. UV coatings provide protection from ultraviolet rays without significantly darkening the lens. Mirror coatings reflect light away from the eyes to reduce brightness. Tints can be added to lenses in various colors and shades.

1. Amit Kumar Pandey-9653443066
Lens Coatings Explained
There are a number of lens coatings that will improve the performance of the lens and clarity of vision.
The more expensive the glasses or sunglasses, the more likely it has several layers of coatings. The
coatings and the reasons for them are listed below.
Scratch-Resistant Coating (SRC)
All lightweight lens materials (plastic, polycarbonate, and high index plastics) have a relatively soft
surface. These materials require a SRC to be applied to both sides of the lens. Glass lenses do not
require a SRC. Because of its natural hardness, glass is even more scratch-resistant than most
lightweight lenses with SRC applied. All prescription lens packages offered by eyekit.co include a SRC
coating.
Anti-Reflective Coating (AR)
As light passes through a spectacle lens, a percentage of it is reflected back from the surface of the lens,
rather than being passed through the lens. Light can also be reflected off the back surface of lenses,
towards your eyes, especially in situations where you are under overhead fluorescent lighting, or when
driving at night with other car's headlights around you. These reflections cause glare, which is
uncomfortable, and also reduce the contrast of what you are looking at, making objects less easy to see.
An anti-reflective coating will reduce these reflections and make your lenses clearer to see through,
helping to reduce eye strain and eye fatigue. For example, computer users get the comfort of improved
contrast and less harsh glare. In addition to this, the coatings are hydrophobic (water repelling) so they
fog up less easily. It is particularly helpful on polycarbonate and high index plastic sunglass lenses since
these lenses reflect slightly more light than glass or plastic lenses.
Anti-Fog Coating (AF)

2. Together with the action of ventilation systems the AF coating permanently bonded to the inside of the
lens absorbs moisture before fog forms. It can fade over time with repeated cleaning of the inside of the
lens. As an alternative, there are now many effective sprays and wipes that can be used to reduce lens
fogging.
Hydrophobic Coating
This treatment weakens surface tension to facilitate run-off of water droplets from the lens surface. It
reduces visual distortion arising when wearing glasses or sunglasses around water or in the rain. It also
resists stains and repels grease and fingerprints, so cleaning your lenses is quicker and easier.
UV Coating
Clear lenses can be enhanced to provide additional protection from UV rays. Without significantly
changing the colour of the lens, a treatment can be applied that will prevent UV light from reaching your
eyes, reducing the risk of certain eye disorders such as the formation of cataracts and macular
degeneration.
To provide 100% UV protection, glass and plastic lenses must have UV coating applied. This is not
necessary for polycarbonate, NXT and most high index plastic lens materials as they block 100% UV
without the need for added coatings.
Mirror Coating (MC)
Mirror lenses are good for situations that require a reduction in the overall brilliance of light, such as
sunlight on snow. They reflect light away from the eye (beyond the standard absorption of a tinted lens)
which is ideal for people who are light-sensitive.
Applied to the surface of the lens only, it gives the lens a shiny mirror-like appearance that reflects rays
from surfaces such as water, snow and ice. They are typically applied in combination with an underlying
sunglass tint. Metallized coatings offer fashion versatility because they can be applied as flash mirrors
with only a blush of reflectance, as full mirrors that mask the eyes or as gradient mirrors.
The density of the mirror coating determines how much light it reflects. Half-silvered mirror coatings have
an even coating of reflective particles across the surface of the lens, but the particles are spaced so about
half of the light striking the lens surface hits a coating particle and is reflected. The remaining 50% of
visible light striking the lens passes between the reflective particles. Some of this light is absorbed by the
underlying lens tint. The remainder passes through the lens to the eye.

3. Mirrors are available in several basic styles. Solid mirrors are a classic sunwear look, especially in silver,
gold and blue. Gradient mirrors being the densest at the top of the lens, and then fading to nothing at the
middle of the lens provides maximum shading of overhead sunlight, while allowing more light to pass
through the middle and lower parts of the lens. This is beneficial for drivers and cyclists or people who like
to read outdoors. Double gradient mirrors are also functional. They are dark at the top and the bottom and
lighter in the middle. Double-gradient mirror coatings are an excellent choice for snow skiing and other
winter activities because they provide excellent protection from both overhead sunlight and light reflecting
off snow on the ground.
Long term durability and abrasion resistance can be improved with the addition of a hard coat and
hydrophobic coating. Also, back reflectance will be more noticeable with a mirror, especially on darker
lenses. An AR coating on the back surface is strongly recommended. All prescription mirror packages
offered by eyekit.co include these coatings.
Tints
A range of coloured tints can be applied to most lenses, from standard sunglass tints through to
specialised tints for activities such as shooting and comfort tints for night time driving. Lenses can also be
tinted to various colours that in some cases aid reading for people with dyslexia. For further information,
read the article ‘Tint’s Explained’ under sunglasses in the Information Resource on the left of this page.
If you require a specialist tint for your lens, eyekit.co have made it easy to specify. Just select the
prescription lens package you require, go to the tint section as prompted, choose your tint and then the
category of tint. For example, if you want a comfort tint or to aide reading with dyslexia, choose category
1 (a light tint), or for shooting in sunny weather, choose a category 3 tint. You can find further information
on lens categories in the Information Resource.