: They block 100% of UVA and UVB rays automatically.
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, which are designed to darken even behind a car windshield—a common limitation of standard transition lenses. Key Benefits to Consider : They block 100% of UVA and UVB rays automatically
: Offers a wide variety of budget-friendly frames, including cat-eye and aviator styles, starting at discounted rates as low as ~~~$29.00~~~ $5.80. SmartBuyGlasses : Sells specialized versions like Transitions XTRActive Go to product viewer dialog for this item. They're ranked based on a number of factors,
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Light Responsive Lenses | Warby Parker | Page 22 - Automatic Darkening
The story of transition lenses (technically called ) began in the 1960s at Corning Glass Works, where William H. Armistead and Stanley Donald Stookey discovered that embedding tiny silver halide crystals into glass allowed it to darken when exposed to UV light. Interestingly, this technology is essentially the same science used in old-fashioned photographic film , but with a reversible chemical reaction that allows the lenses to clear up again indoors.