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What is the segment size of the bi-focal lenses?

bi-focal lenses segment size
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What is the segment size of the bi-focal lenses?

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Our bi-focal glasses come with a D shaped bi-focal segment (D28). We can supply executive style bi-focal glasses at an additional cost of 10. The segment is normally positioned 3 mm below centre and the glasses are made assuming that they are worn 12 13 mm from the eye (the back vertex distance).

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