How much does LENS SIZE affect vision....?

Discussion in 'Eye-Care' started by Leesa_Tay, Feb 21, 2008.

  1. Leesa_Tay

    Leesa_Tay Guest

    My dad was asking me about his reading glasses. His glasses, which
    were prescribed about 10 years ago for reading still work great. He
    has no problems reading whatsoever.

    His glasses are somewhat big though, or so it seems. The dimension of
    his glasses are roughly 1 3-4" X 1 1/2". they SEEM larger than
    some of the glasses I see today.

    Now.. Is there are reason why some lenses are bigger than others?
    And... does the size of the lenses affect the vision in any way? ie..
    visual field etc...

    So... To sum up here. What are the pros and cons of bigger and
    smaller type lenses? Or.... is it purely "cosmetic".

    Thanks LEESA

    PS: My dad is FARSIGHTED with some astigmatism in both eyes.
    Leesa_Tay, Feb 21, 2008
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  2. Leesa_Tay

    Mark A Guest

    The recent trend for very small lenses is a fashion trend, not a medical
    one. But it has made possible by stronger frame materials (which need less
    bracing at the bridge) and more sophisticated lens designs which enable a
    smaller lens.

    The benefits of a smaller frame is mostly cosmetic, but a smaller lens is
    lighter and less likely to slip out of position on the face (which can
    adversely affect vision). A larger lens will usually offer better peripheral

    With a progressive lens (with a separate reading, distance area and
    intermediate transition zone) a larger lens often has larger reading and
    distance viewing areas. But once you get to a certain size, then going
    larger does not have much additional benefit.
    Mark A, Feb 21, 2008
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