MetroSunnies Con-Strain PRO meet international quality standards for Europe and USA (EN ISO 12312-1:2013+A1:201 and ANSI Z80.3-2018) passing Solar UV-A, UV-B and Blue Light Transmission Tests - Intertek Certified.
Automatically turns clear to dark under the sun. Note that some Con-Strain anti-radiation lenses have clear, bluish, yellowish or greenish tint when reflected in light.