Monggaz brand 1.56 index prescription optical lenses, designed to block blue light.These are photochromic lenses (Photogrey) that darken when exposed to sunlight.The lenses have a hard multi-coating (HMC) for anti-reflection and scratch resistance, and they feature a UV420 filter for UV protection.This specific lens is graded as "Grade A" and has a diameter of 70mm
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