Anti-Re­flec­tive Coat­ing

Popular Science - - GOODS -

A dark, shiny sur­face tends to act like a mir­ror, es­pe­cially in bright sun. On the back of the lens, in­vis­i­ble lay­ers of sil­ica ox­ide, ti­ta­nium ox­ide, and zir­co­nium ox­ide re­fract light in dif­fer­ent di­rec­tions, keep­ing re­flec­tions of your own face out of sight.

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