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These are color changeable lenses available for CR-39 (plastic) lenses / Polycarbonate lenses and high-index plastic lenses. Transition lenses are clear indoors, They achieve even greater indoor clarity when combined with an anti-reflective coating. They are comparable to sunglasses in bright Sunlight and tint mildly in indirect sunlight. In high temperatures, they offer the darkest outdoor performance and when the light changes, they are the fastest adjusting lenses, so you always see clearly and comfortably. These lenses block 100% of the sun’s harmful UVA and UVB rays and are scratch-resistant. Transition lenses are up to 50% lighter in weight than photochromatic glass lenses. Transition plastic lenses are more impact resistant than photochromatic glass lenses. They are available in two shades: grey and brown.