prescription sunglasses - % UV filtered?

Discussion in 'Glasses' started by anonymous, Dec 26, 2003.

  1. anonymous

    anonymous Guest

    I have been shopping for sunglasses. I see how most of
    non-prescription sunglasses have a rating of UV 400 which describes
    how well it filters UV light. I wear glasses so I want to get a pair
    of prescription sunglasses made. What is the UV rating for
    prescription sunglasses, and how does it compare to non-prescription
    sunglasses with UV 400 rating? Also when sunglasses are rated UV 400,
    does it mean that it filters UVA and UVB equally? Does it protect
    your skin (that is behind the sunglasses) better than sunscreen?
    Also, when I get my prescription sunglasses made, what should I look
    for and what options should have done on them?

    Any answers would be appreciated.

    Thanks very much.
     
    anonymous, Dec 26, 2003
    #1
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  2. anonymous

    Mark A Guest

    I can't answer all you questions, but here are a few answers.

    Prescription sunglasses are usually made from ordinary clear prescription
    lenses that are processed in a dye solution to darken them. The tinting can
    be adjusted for density and gradation (can be made to lighten at the
    bottom). This is often done right in the optician's store.

    Most regular clear prescription lenses provide between 98% - 100% protection
    from UVA and UVB before they are tinted. To know whether the lens material
    that you plan to have tinted already has UV protection, please tell us the
    lens material or ask your optician. Lens material includes the manufacturer
    of the lens and index (1.50, 1.60) or other designation (polycarbonate,
    Spectralite, etc). Some lens materials are harder to tint than others.

    The main choice in prescription sunglasses is the color (brown, gray, or
    green). Some Optometrists have told me that far sighted people (like myself)
    should have brown tinting, but not sure about others. Brown tends to
    increase contrast a little (good) but does not produce colors accurately
    (but your eyes mostly adjust in a few minutes). I would avoid green,
    especially if driving with glasses. You can get a combination of colors
    (gray/brown) at some opticians.

    Polarized lenses, or mirror coated lenses are also options (with or without
    tinting).
     
    Mark A, Dec 26, 2003
    #2
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