can most people wear extended wear lenses

Discussion in 'Optometry Archives' started by cliveP, Sep 28, 2004.

  1. cliveP

    cliveP Guest

    I am a contact lens wears (many years) and currently use Biocompatables
    Proclear (-5.5 14.2/8.6) without problem. I am considering asking my optican
    about exteneded wear (purevision / night & day) because of the added

    a) Is an extended lens likely to fit ok? 14/8.6 for purvision and 13.8/8.4
    13.8/8.6 for Night and Day. I have large pupils hence by current use of
    proclear as they are 14.2 (although other optician have prescribed smaller
    lenses before?)

    b) Aside from fit, is their a preference between Purevision or Night on Day
    for any reason (comfort, cost, etc)

    c) Is sleeping in a extended wear safe? Would the extended wear lens used
    for 30 days actually let more oxygen to my cornea than the current proclear
    lens uses all day every day, and out at night during sleep?

    d) Any comments?
    cliveP, Sep 28, 2004
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  2. cliveP

    LarryDoc Guest

    Silicone hydrogels do not fit as do HEMA hydrogels or GMMA hydrogels.
    The only way to know if it fits is to be trial fitted with them and
    observe the performance on the eye.
    And let's not forget about the other silicone lenses recently available
    and soon to be available. The preference should be based on fit and
    comfort. Cost is a personal issue.
    Clinical studies show they are safe when prescribed and used as
    directed. If you pay attention to that, and remove them if you suspect a
    problem, get regular check-ups, they are likely to be safe. All the new
    silicone lenses allow at least three times and a much as 5 times the
    oxygen transmission of the Proclear which, by the way, has one of the
    highest levels of non-silicone based soft lenses.
    Yes. Your pupil size. If it is more than 7.0 mm in reduced
    illumination, you may want to consider the lens optic zone diameter as a
    key issue, if night vision matters. The overall diameter is meaningless,
    if the lens centers well and fits correctly. I'm not certain without
    checking which lens has an optic zone of at least 8 or 9 mm.


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

    The Eyecare Connection
    larrydoc at eye-care-contacts dot com (remove -)
    LarryDoc, Sep 28, 2004
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  3. cliveP

    Dom Guest

    In a nutshell they are safe and you are probably better off changing
    over to extended wear for the oxygen benefit.

    Fit: the extended wear lenses fit most people very well with less
    fitting problems than conventional soft in my experience.

    Purevision vs Night & Day: ideally try both, maybe one in each eye if
    possible. No clear favourite, it's "horses for courses".

    Safety: as far as microbial keratitis is concerned, research is still
    underway but it seems to be as safe as what you are doing now. One of
    the biggest issues with the current generation of extended wear lenses
    is CLPC (irritation under the eyelids)... this is not "dangerous" more
    more irritating. There are other potential issues, as there are with any
    type of contact lens.

    Comments: go for it, with the help of an optician/optometrist who is
    experienced with these lenses.

    Dom, Sep 29, 2004
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