Understanding Scleral Shape - Dr. Sheila Morrison

Discussion in 'Courses' started by AdminWolf, May 24, 2017.

  1. #1 May 24, 2017
    Last edited by a moderator: Aug 15, 2017
    AdminWolf

    AdminWolf Site Administrator & Tech Lead
    Staff Member

    14,865
    Messages
    Joined:
    Feb 24, 2001
    School/Org:
    University of Michigan Medical School
    City:
    Lake Oswego
    State:
    OR
    [​IMG]

    32 COPE-Approved Credits
    LIVE Sept 23 & 24, then On-Demand Thru Dec 1, 2017!
    Watch live or at your own pace!

    REGISTER NOW


    Understanding Scleral Shape
    Sheila Morrison, OD, FSLS


    [please place all discussion about this lecture in this thread.]
     
  2. Charles A McBride

    Charles A McBride ODwire.org Supporting Member

    8,614
    Messages
    Joined:
    Jun 22, 2009
    School/Org:
    PUCO
    City:
    Beaverton
    State:
    OR
    Hi Dr. Morrison. I had time to watch the first half of this lecture on ODWire tonight and paused on your treatment of anterior segment OCT and scleral lenses. What are your thoughts on judging scleral lens shape via OCT given the role that index of refract plays? Are the caliper's accurate?

    I listened to a Huang lecture a couple of weeks ago where he pointed out the the posterior "bulge" we see when viewing Intacs via OCT was artifactual due to differences in index of refraction. He hinted that there is a way to correct for index of refraction, but, either he didn't expand, or I wasn't paying attention.

    (I use a Spectralis, but I don't think their "caliper" has ever been FDA approved.)

    Thanks for your thoughts. -Charlie

    Charles McBride
    Beaverton, OR
     
  3. #3 Oct 3, 2017
    Last edited: Oct 3, 2017
    Greg Gemoules

    Greg Gemoules Well-Known Member

    12,892
    Messages
    Joined:
    Sep 5, 2013
    School/Org:
    ICO
    City:
    Coppell
    State:
    TX
    Dr. Morrison is pretty sharp. I wished that I could see her presentation in Fort Worth later this month, but I'll be out of town. Maybe I can watch it here!

    I recently received a few dozen OCT images from an imaging center of a patient in Canada, and I'm pretty sure it was one of the newer spectral/frequency/Fourier domain units. I noticed discontinuities in the images at the edges of the lens. I don't know what instrument was used. It's a small error, but it does illustrate what I have been saying for many years, which is that those images are useful from a qualitative standpoint, i.e. to show the lens position relative to the eye. If I know the corneal thickness and the lens thickness, then it's easy to estimate the vault with enough precision for clinical purposes.

    I've probably mentioned this to you in the past, Charlie? I would like to get my hands on a swept-source Tomey SS-1000 CASIA, but they have not received FDA approval, or at least not insofar as I am aware.
     
    Joe DiGiorgio O.D. likes this.