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TR90 Frame reading glasses.
Lightweight readers glasses.
Sunglasses readers reading glasses.
Men and women reading glasses.
Dimensions: Frame 13.7cm (5.4in) wide, arms 14.1cm (5.5in), lenses 5.1x4.3cm(2.0x1.7in),Bridge1.8cm(0.7in).
Description Transition photochromic gray bifocal reading glasses lens optical glass containing silver halide microcrystals, Phototropy reversible reaction according to the principle, In the sunlight and UV irradiation variable dark, Completely absorb ultraviolet and visible light absorption of neutral,Back to the dark, Can restore the colorless transparent.