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  1. Does D segment or round segment produce more jump?

    Hello,

    I'm getting conflicted answers so thought I should ask on here,

    1. 'Round is more blended than D seg so there is less of a jump, with D seg there is more of a sudden introduction of...
  2. Most common solution to differential prism in anisometropes wearing bifocals?

    Hi there,

    Reading over the different solutions e.g. unequal segment sizes, crown glass segments, Franklin split, slab off, all of them have disadvantages and seem to be rare. Is it actually...
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    CR39 aspherics or 1.74 high index aspherics?

    Hello, quick question please,

    So for Low Vision Aids it's better to have CR39 due to it's high V value and therefore wider of field, correct?

    However if somebody has chosen to get SV reading...
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