Over-minus lenses for night vision problems?

Discussion in 'Eye-Care' started by crvc, May 12, 2005.

  1. crvc

    crvc Guest

    According to this abstract, minus lenses caused mild decrease in halos
    by constricting the pupils. I'm asuming if it works for halos it might
    work for starbursts. So what are minus lenses? Anyone had experience
    with them?



    1: J Refract Surg. 2004 Mar-Apr;20(2):149-54. Related Articles, Links

    Reduction of pupil size and halos with minus lenses after laser in situ
    keratomileusis.

    Wachler BS, Hiatt D, Chou B, Christie JP.

    Boxer Wachler Vision Institute, 465 N. Roxbury Drive, Suite 902,
    Beverly Hills, CA 90210, USA.

    PURPOSE: To evaluate the amount of miosis induced by over-minused
    lenses and to assess subjective reduction of halos following laser in
    situ keratomileusis (LASIK) with such lenses. METHODS: Part I: Infrared
    pupil diameter was assessed in 14 patients who had not had ocular
    surgery. The accommodative/miotic reflex was stimulated with concave
    trial lenses in -1.00-D increments up to -4.00 D while viewing the
    20/40 acuity line. Part II. Subjective halos around a distant light
    were assessed in 14 patients following LASIK for myopia, with and
    without a -1.00-D lens over manifest refraction. RESULTS: Part I: 100%,
    79%, and 64% of patients clearly saw the 20/40 line with a -1.00-D
    lens, -2.00-D lens, and -3.00/-4.00-D lens, respectively. Mean pupil
    diameter decreased by 0.2 mm with the -1.00-D lens (P = .02), 0.5 mm
    with the -2.00-D lens (P = .003), 0.9 mm with the -3.00-D lens (P =
    ..008,), and 1.1 mm with the -4.00-D lens (P = .008). Part II: 11 of 14
    patients (79%) noticed a decrease in the size of the halo (30% average
    reduction) when over-minused by -1.00 D. CONCLUSIONS: Pupil diameters
    and halos decreased with a -1.00-D overcorrection in patients following
    LASIK. Patients with pupil-dependent night halos after LASIK may
    benefit from mildly over-minused lenses.
     
    crvc, May 12, 2005
    #1
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  2. crvc

    Dr. Leukoma Guest

    Honestly, do we really need a study to prove that?

    I guess if you are a presbyope, 1.00 diopter of minus will produce 1.00
    diopter of distance blur. If you are not a presbyope, 1.00 diopter of
    minus may only give you a slight headache, because you will be
    effectively a 1.00 diopter hyperope.

    DrG
     
    Dr. Leukoma, May 12, 2005
    #2
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