If you wear prescription glassses, you have probably been advised to put A/R coating (anti-reflection coating) on your lenses but you may wonder what it’s for. In this video tutorial an expert Melissa Russell will give you a clear definition of Anti-Reflection Coating and explain why it is used on lenses.  The video provides some examples of lenses with/without the A/R coating to demonstrate the difference. You may also want to read more about A/R coating here Anti Reflection Coating.