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Trifocal 7X28 Plastic Transitions Lenses are light weight variable tint lenses that darken on exposure to bright sunlight.
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Trifocal Flat Top 7X28 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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Trifocal 7X28 Mid-Index 1.56 Transitions Lenses are thinner, light weight variable tint lenses that darken on exposure to bright sunlight. Lenses are light weight variable tint lenses that darken on exposure to bright sunlight.
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