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An anti-reflective (AR) coating on a watch is a thin layer applied to the crystal (usually sapphire) to reduce glare and reflections, allowing for much clearer dial visibility in bright light by letting more light pass through . This optical treatment works by causing light waves to interfere destructively, and while it vastly improves legibility, it's not scratch-proof and often leaves a tell-tale blue or green reflection.  Using AR has become a common practise with High End