iris dilating optics (vs "drops")

Discussion in 'Optometry Archives' started by CHale, Nov 25, 2004.

  1. CHale

    CHale Guest

    Hello all--I'm new to this group, but something that's been bugging me
    for literally years, came up anew in the past few days talking with
    some friends.

    About 20 years ago in Albuquerque NM, I happened to pick an
    optometrist out of the phone book to get a renewed prescription and
    glasses, etc. He turned out to be a rather old German guy, who
    certainly seemed highly proficient. When it came time to dilate my
    eyes for glaucoma and a laser damage exam (I work in R&D with lasers),
    he told me he was going to use a set of optics mounted in his basic
    "turreted" optometry machine (I apologize for not knowing the name of
    that device--) that would dilate my pupils for a few minutes, long
    enough for him to do the exam. "No drops and 2-3 hours of being blind
    after I leave?", I asked; nope, none of that, the
    optical/physiological effect simply fades away within a few minutes!
    And indeed, they worked like a charm. I was struck enough at the time
    by how very cool this was, that I asked him about them; he said they
    were from Europe and he didn't see their use much here in the US.

    Ever since that exam a long time back, I've queried my various
    optometrists and opthamologists over the years, and every single one
    has never heard of such a thing, and they typically look at me like
    I'm making it up! But I swear this guy used this excellent technique.
    Does anyone here have any knowledge of this technique for pupil
    dilation "sans drops"? Thanks--
    C. Hale, Lafayette, CO
    CHale, Nov 25, 2004
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  2. CHale

    RM Guest

    I am not aware of such a thing. Doubtful that it exists as you describe it.
    I bet he was avoiding using the drops and was simply using a "super pupil"
    type fundoscopic lens that enables one to see the posterior pole (albeit not
    much of it) without dilation. I frequently use such a lens for quick and
    dirty fundoscopic evalution.

    There is a time to do this and a time to open up the eye with drops for a
    careful exam of the periphery.

    RM, Nov 25, 2004
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  3. CHale

    Dr. Leukoma Guest

    I agree with RM. There are condensing lenses for use in conjunction with a
    slit lamp for use in examining the fundus without dilating the pupil. I
    keep one in my clinic coat pocket. The magnification can be increased at
    the slit lamp to obtain a more detailed view of the posterior pole.
    However, the field of view is, in my opinion, not as great as with a
    dilated exam and using a binocular indirect.

    Dr. Leukoma, Nov 25, 2004
  4. I am curious as to the optics of such lenses. What are the focal lengths
    (powers) and where are they placed with respect to the patient's eye and the
    examiner's eye?

    Repeating Rifle, Nov 25, 2004
  5. CHale

    LarryDoc Guest

    66 to 98 diopters. 10-30mm in front of cornea. Viewed 6X to 40X.

    LarryDoc, Nov 25, 2004
  6. CHale

    S Akky Guest

    S Akky, Nov 26, 2004
  7. CHale

    drfrank21 Guest

    I bet the op is referring to the old hruby lens that used to be
    attached to the slit lamp because I don't think the volk lens
    was around 20 yrs ago.

    drfrank21, Nov 26, 2004
  8. CHale

    RM Guest

    I'll bet your right!


    RM, Nov 27, 2004
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