New prescription: which lens type and AR?

Discussion in 'Optometry Archives' started by K.L., Jun 17, 2004.

  1. K.L.

    K.L. Guest

    I will be filling a new prescription shortly. I was hoping I could
    get some recommendations on what type and brand of lenses and/or AR
    I should purchase.

    My prescription is as follows for both eyes:

    -3.50-0.75x180

    Visual acuity is fairly important to me, and I've heard that you
    sacrifice some of this in the higher index lenses; so I'm not certain
    what material (CR39, hi-index, etc) I should go with. If I should
    go with a high index lens, which index?

    For high index brands, I can select from Essilor, Optima, Pentax,
    Hoya and Zeiss from between 1.56-1.71.

    Also, regarding AR coatings, I've read mixed suggestions as to whether
    to apply one to a lens. It seems as though they're more practical
    with a high index lens.

    For AR coatings, I can choose from Zeiss and Crizal.

    Any opinions would ber appreciated. Thanks in advance.
     
    K.L., Jun 17, 2004
    #1
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  2. K.L.

    Mark A Guest

    AR is not more "practical" for high index lenses, but may be more
    "important" to avoid unwanted reflections that cut down on the amount of
    light that reaches the eye. The main consideration for AR is durability.
    Crizal is one of the better ones. Zeiss may also good, but I am not that
    familiar with it. If you get AR you must be very careful with the way you
    handle and clean the lens because they are more fragile.

    For the best optics, I would stay away from Polycarbonate (1.59). If high
    impact resistance and high tensile strength is required, Hoya Phoenix (1.53)
    is a MUCH better alternative (this is a Trivex material).

    Sola Spectralite (1.54) is also very good. Given the range of vendors you
    listed, I suspect that your optician could get Sola lenses for you. If not,
    it is available at many other opticians. Wal-Mart optical carries some Sola
    products.

    For your moderate RX. you don't need anything higher than 1.60. Typically
    the higher the index, the worse the optical quality. Polycarb is the biggest
    exception because it is much worse than other lenses with a similar index.
     
    Mark A, Jun 18, 2004
    #2
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