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Bifocal 28 Plastic Transitions Lenses are light weight variable tint lenses that darken on exposure to bright sunlight.
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Bifocal 28 Trivex Transitions VI Lenses are ultra light weight xtra impact resistant variable tint lenses that darken on exposure to bright sunlight.
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Bifocal 28 Mid-Index 1.56 Transitions VI Lenses are thinner, light weight variable tint lenses that darken on exposure to bright sunlight.
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