There are a number of coatings which can be added to your lenses which can improve your vision or can be used for cosmetic or medical reasons:
Anti-reflection/Glare coating:
Typically referred to as an ‘A/R coating’, an anti-reflection coating is a very thin layer coated on the lens, which as the name suggests, helps to reduce reflections.
It also increases the quality of vision by allowing 99% of light to pass through the lens.
This image shows the difference between a coated lens, and a non coated lens and the improvement in vision:
Anti-reflection coatings also help considerably when driving at night, are more cosmetically appealing as your eyes are clearly visible and can reduce glare from computer screens.
Premium versions also have a scratch resistant and water repellent hydrophobic coating applied which further enhances your vision.
UV400 coating:
Is a coating applied to the lens which eliminates harmful UV rays from the sun.
This diagram explains the difference between a ‘coated’, and a ‘non-coated’ lens.
UV 400 Coated Lens: Non Coated Lens:
Lens tints:
Having a tint on your lenses can be for a number of reasons.
You may wish to have your glasses made into sunglasses in which you would select a dark tint, (80%), or you may choose a lighter tint for cosmetic appearance or to reduce glare, if you are light sensitive, (10%).
This image gives examples of 'typical' lens tint colour options:
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