Sunglasses necessary for UV protection?

Discussion in 'Glasses' started by me63401, Oct 2, 2003.

  1. me63401

    me63401 Guest

    Im a 45 yr old male

    Ive always heard it wise to wear sunglasses as much as
    possible to prevent eye damage from UV rays.

    Im curious..... can one get UV protection from just
    wearing clear prescription glasses..... no tinting?

    Ive always worn corrective lenses since I was 10 yrs
    old..... but have seldom worn sunglasses. Don't wear
    them now

    Did I get ANY protection form UV rays just wearing
    corrective lenses all them years?

    Is it still a very wise thing for me to get TINTED
    sunglasses anyway?

    I guess what Im curious abt... is it the "tinting" that
    gives you UV protection..... or if it is just the glass
    or plastic "material" of the lenses that give you
    protection regardless of the color?

    How does it work?

    And should I get sunglasses anyway?

    me63401, Oct 2, 2003
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  2. Ive always heard it wise to wear sunglasses as much as
    In most countries they have UV protection. E.g. in Italy they are
    REQUIRED to have UV protection otherwise they can't be sold.

    Probably. But it's also possible that in the past the prescription
    glasses didn't have the UV protection...
    I don't know
    Wait for other replies :)

    Sunglasses usually are wider and cover the eye better.

    BUT, tinted sunglasses will make your pupils open wider so the UV which
    gets into the pupil from the side of the glasses might be about the
    same, while the UV which reaches the eyelids/sclera will probably be
    lower with sunglasses. Best would be CLEAR sunglasses! :)

    The UV is a tint but since it's an UV-tint it's not a visible color, so
    glasses with UV tint only are clear (sometimes a bit yellowish if the
    tint is really wide spectrum and goes a bit over the blue)

    The darkening shouldn't have any effect on the UV by itself

    The material also might shield some UV.

    Someone recommends it. For preventing eyelids cancer, conjunctivitis,
    eyelid ageing sunglasses will be better than prescription glasses. For
    diseases internal to the eye (cataract, floaters and...? can't remember)
    due to the reason said above, probably tinted sunglasses are equivalent
    to prescription glasses; clear sunglasses a bit superior.

    I GUESS.

    [Not a doc]
    Pipino Il Breve, Oct 2, 2003
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  3. me63401

    LarryDoc Guest

    This is a question that pops up here from time to time.

    All ophthalmic lenses block short-wavelength UV, usually to about 340nm.
    That includes the shorter wavelength UV radiation which most
    science-based discussion would conclude can damage eye (and skin)
    tissue. These are the so-called burning rays.

    Polycarbonate, Trivex and most high-index plastic lenses also block
    additional UV wavelengths from 340 to 400nm (400 is the beginning of the
    visible spectrum for humans). Perhaps arguably, some wavelengths in
    this range may contribute to longer-term tissue changes.

    So yes, clear lenses without tint can provide UV protection.

    The addition of UV coating to polycarb and the other plastics (see
    above) is a scam. Added to CR39 plastic and glass, this will extend UV
    blocking to include the longer wavelength radiation, but whether or not
    that is of value is questionable.

    You must also consider the exposure to UV that enters the facial area of
    the eyes from above, below and from the sides. Better protection is
    acheived by spectacle lenses that shade those areas----or wearing a hat
    with a brim.

    It is a myth that wearing a tinted lens is potentially more damaging
    because it allows the pupil to dilate (open up). With the exception of
    very dark tints, this simply does not occur, and in that specific
    situation when it might, so much incident radiation is being blocked by
    the lens that it doesn't matter in any event.


    Dr. Larry Bickford, O.D.
    Family Practice Eye Health & Vision Care

    The Eyecare Connection
    larrydoc at m a c.c o m
    LarryDoc, Oct 2, 2003
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