Some questions regarding RGP contact lenses

Discussion in 'Contact Lenses' started by Bill, Oct 24, 2005.

  1. Bill

    Bill Guest

    I'm getting back into RGP contact lenses after a long hiatus, and
    reading the group has helped me a lot. I have a couple of lingering
    questions, though.

    1. Does having dry eyes decrease the amount of oxygen that gets to the
    eye? It seems that even a hyper-Dk lens won't help if there are less
    tears to deliver the oxygen to the cornea.

    2. Does the wetting angle of the lens material only relate to initial
    comfort or all-day comfort? My understanding is that after the lenses
    have been in the eye for a little while, a film develops on the lens
    that reduces the wetting angle on all materials. Does the wetting
    angle really matter?

    3. Does the use of eyedrops create a dependency on eyedrops? I work at
    a computer all day, and my eyes often get red and scratchy. Eyedrops
    help, but I wonder if I'm sacrificing long-term comfort for short-term
    comfort by using the eyedrops.

    I used to wear Boston ES lenses years ago, and they were OK. Recently
    I've tried the Menicon Z, the Fluorocon, and soon I'll be trying the
    Optimum Extra. My hope was that the low wetting angle of the Optimum
    lenses might help with the dry eye. Does anybody have any opinion on
    these materials (the Optimum in particular)?

    TIA -- Bill.
     
    Bill, Oct 24, 2005
    #1
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  2. Bill

    Dom Guest

    No but dry eyes can make your eyes uncomfortable. If your eyes are dry
    then the oxygen can still get to your eyes more directly from the air!
    Wetting angle and comfort will vary as lens gets older and more
    deposited over the weeks and months. Variations in comfort throughout
    the day are often connected with tear film quality/dry eye issues.

    It may create a 'psychological' dependency, only in that you realise
    that the drops are helping you so you want to keep using them! Eyedrops
    don't adversely affect your eyes themselves - assuming you are talking
    about ocular lubricants/artificial tears rather than
    decongestants/vasoconstrictors etc. Keep using 'em.


    Dom
     
    Dom, Oct 25, 2005
    #2
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  3. Bill

    Quick Guest

    Errr, I work in front of a computer all day in an air conditioned
    office in a very dry climate. I've been using drops every 2 to 4
    hours. My doc was pretty firm that he wanted me using drops
    with no preservatives or "soft" preservatives. He and I like Blink.
    He says that does have a "soft" preservative that he feels is OK.
    He says that if you are using drops with that frequency you don't
    want to be dosing your eyes with preservatives that much.

    (no, I have no idea what the difference is between "soft"
    preservatives and other preservatives that may not be good
    for you in quantity).

    -Quick
     
    Quick, Oct 25, 2005
    #3
  4. Bill

    Bill Guest

    I'm using Claris rewetting drops, and the bottle says "polixetonium
    chloride 0.0060% as the preservative." I don't know anything about
    that.

    Quick, do your eyes get really red when you work in front of the
    computer all day? Mine do, and sometimes I wonder if I'm doing damage
    to my eyes. My doctor doesn't seem too concerned. At any rate, five
    or six hours using the computer really takes its toll.

    -- Bill.
     
    Bill, Oct 25, 2005
    #4
  5. Bill

    Quick Guest

    No. But my eyes rarely get red for any reason.

    I'm not up on the good and bad chemicals or how much
    is a lot in eye care stuff. My doc likes Blink. I like Blink
    because it seems to be just the right viscosity for me,
    feels good, and (relative to the couple of others I tried)
    lasts a while.

    -Quick
     
    Quick, Oct 25, 2005
    #5
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