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These are clip-on lenses that attach to your existing prescription glasses and darken in UV light, so you don't need a separate pair of prescription sunglasses. They combine photochromic tinting with polarization, which cuts glare from roads, water and snow. The clip-on format suits people who already wear glasses and want one set of frames for indoor, outdoor and night driving. Against dedicated prescription sunglasses, they cost far less and switch between clear and tinted automatically, but they add bulk to your frames and the tint depends on UV reaching the lens.
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These clip-on lenses attach to prescription glasses, so one pair of frames can also serve as sunglasses. The lenses combine photochromic, polarized and night vision functions.
The photochromic lenses react to UV intensity. Indoors or in overcast light, the tint is clear. In direct sunlight, it deepens to a dark grey or smoke tint within seconds. The polarized film reduces glare from surfaces such as wet roads and water, and it helps ease eye strain on long drives. A yellow-base tint increases contrast in low light and reduces the halo effect around oncoming lights at night. In flat light, such as fog or rain, the lenses increase contrast.
The lenses are TAC (Tri-Acetate Cellulose) and block 100% of UVA and UVB rays (UV400). The clip mechanism is coated in soft medical-grade silicone to protect prescription lenses from scratches.
