Scratch-resistant Coating:

No eyeglass lenses (Not even glass lenses) are scratch-proof

Lenses with front and back scratch-resistant coating have a much harder surface that is more resistant to scratching.

Most eyeglass lenses, including high-index lenses and lenses made of polycarbonate, have an inbuilt scratch-resistant coating.

Keep in mind that even the best scratch-resistant coating can't completely protect your lenses from wear and tear.

To keep your glasses looking new, store them in a cushioned case when not in use, and clean your lenses with a microfiber cloth and the cleaning solution recommended.

Hard coat (HC) lenses are coated with a protective coating that increases the abrasion resistance of the lens material.

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Anti-reflective coating (ARC) and Hard Multi-coat (HMC):

Anti-reflective coating (also called AR coating or anti-glare coating) is a microscopically thin multilayer coating that eliminates reflections from the front and back surface of eyeglass lenses.

AR coating is highly recommended for all eyeglass lenses

The Hard Multi-Coat (HMC) is an integration of 2 types of coatings.

Hard Coat - to increase the abrasion resistance of the lens

Anti-Reflection Coat (AR) - to increase the transmittance of the lens and reduce surface reflections

Single-layer:

                AR coating is a thin, single layer applied to the lens to reduce unwanted reflections from the lens surface,

                The single-layer coating is not effective because of lesser thickness and it will be in purple color

Multilayer coating:

               Multilayer coating comes with three-layer coating, it will be in green or blue-green color

Advantages

Better light transmission, decrease glare, and improved night vision

Reduces lens surface reflections

Disadvantages

if the lenses are cleaned properly, dirt present on the lens may cause damage to the coating and loses lens integrity

Smudges are more visible on the lenses than uncoated lenses