Is Silicone Hydrogels Dangerous?

Discussion in 'Optometry Archives' started by Pia, Feb 25, 2009.

  1. Pia

    Pia Guest

    I plan to switch to soft contacts for daily 8 hour use and after some
    reseach, thought the silicone hydrogels are better because I have
    dry eyes. But according to the above sites. Silicone Hydrogels are
    dangerous even when used daily (not extended) because of the
    new materials. The second article quotes:

    "While it may be true that the incidence of microbial keratitis is no
    different between silicone hydrogel continuous wear and hydrogel
    daily wear, I don't hear much from silicone hydrogel promoters
    warning practitioners and patients about superficial ocular
    related to silicone hydrogel wear. Until the industry further
    silicone hydrogel technology — when any other "surprises" come
    out in addition to PHMB incompatibility, GPC, SEALs and mucin".

    What do you think? Who have similar experience with the stories
    the first article about people being damaged by the silicone

    Pia, Feb 25, 2009
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  2. Pia

    Mike Ruskai Guest

    I can tell you that I've been wearing them for over two years now, keeping
    them in anywhere from 8 to 120 hours, and have had no problems.
    Mike Ruskai, Feb 26, 2009
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  3. Pia

    Colin B. Guest

    I don't wear mine overnight, but I agree 100%. I have dry
    eyes due to cornea problems and the silicone hydrogel lenses
    are extremely comfortable and give excellent vision.

    Colin B., Feb 27, 2009
  4. Pia

    Pia Guest

    After asking many optometrists at the mall whether soft or hard
    are better. Some say that study shows people who use soft contact
    only last an average of 5 years before they become intolerant. It
    appears that the liquid component of the hydrogels and silicone
    itself can slowly form immune response such that next time one
    wears them, the eye IgE and immunoglubulins would see the
    lens as foreign object and attack it by forming mast cells around
    the eyes much like organ transplant being rejected. Scary isn't it.
    So I guess gas permeable lens would be a better choice as it has
    less liquid component and the immune system can more easily
    identity it as a lens. I asked them what about Daily soft contact
    disposable. They said that since the eye now treat the lens as
    foreign harmful body. It would initiate immune response to it
    like autoimmuinity or lupus. This may be why some people can
    no longer wear contact lens like Silicone Hydrogels after their
    immune system can become sensitive to them. Maybe before
    one wears such lens. There must be complete immune system
    analysis first, isn't it.

    Pia, Feb 28, 2009
  5. Pia

    Neil Brooks Guest

    Ahhh, yes.

    Pia: you might consider exhaling. With all due respect, and/but in
    all seriousness.
    Neil Brooks, Feb 28, 2009
  6. Pia

    Pia Guest

    No. What they are saying is that dirt and protein can easily
    stick to soft contact lens because it is made of water unlike
    hard lens which has only 2% water (soft contacts have
    50% water average). Logical isn't it?

    After the eyes got infected from the protein deposit
    or other stains. It can become sensitive and reject the
    lens. Also logical, isn't it?

    Hence soft contact has significantly higher risk.

    Pia, Feb 28, 2009
  7. Pia

    Pia Guest

    In addition to the above, silicone hydrogels material
    can hold more protein, etc. deposits not because
    of the water in the lens but because of the silicone
    materials themselves resulting in more eye infection.

    Is this true at all?

    Now since there is no disposable daily wear silicone
    hydrogels. A montly silcone hydrogels would be more
    risky and can move the thresholds of users to more
    dangerous edge even when used 8 hours a day like
    older hydrogels as shown in the following report in

    "I have worn soft contact lenses for over 35 years with no
    problems. Switched to the Silicone Hydrogels Accuvue
    Oasis in the Right eye only. 2 months ago, Blepharitis,
    Giant Pupilary Conjunctivitis developed in the Right eye
    only. Spent well over $600 in RX, beginning with family
    M.D., then Optometrist, now being treated by Opthalmologist.
    No insurance, of course. The conjunctivitis continues.
    One can only use steroid eye drops for a limited duration,
    yet the redness, dryness, discomfort continue. It is
    doubtful I will ever be able to wear contacts again.
    Oh yeah, I finally broke down 2 days ago and spent
    over $800 (no insurance)on new progressive eye
    glasses since I can’t wear the old SV glasses that I
    used to wear in the late evenings. I feel like I was
    used as an unsuspecting, unaware lab rat. Let me
    know when and where to sign up for the class action
    law suit."

    Pia, Feb 28, 2009
  8. Pia

    Dan Abel Guest

    I was going to make a joke here, but decided it wasn't funny.

    How could that happen?
    I've got you there, Mike. This is the dreaded DHMO:


    I've got the T-shirt! I love to show it to doctors and nurses. They
    get this quizzical look, then the concerned look and then they break out
    laughing when they figure out it's...WATER!
    Line forms at the right. Please, no pushing or shoving, you'll all get
    an interview.

    Dan Abel, Feb 28, 2009
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