Results 1 to 5 of 5

Thread: Yoked prism for glaucoma patient...

  1. #1
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    4,495

    Yoked prism for glaucoma patient...

    Seventy five year old women has glaucoma and is being treated by an MD. As so often happens she assumes a new refraction can fix any vision problem.

    I have her slowly accepting the loss of vision in her right eye (especially) but she says if she lowers her chin and covers her left eye she gets some vision which is definitely better than a straight ahead gaze otherwise.

    I'm wondering if I might suggest to the MD I try a simple sv yoked base up rx to see what happens. My doc (OD) who caught the glaucoma says she'd be surprised if it works. She noted how the patient tends to bob her head around trying to find optimum vision.

    r -4.50 -2.50 x 28
    l -4.25 -2.50 x 168
    add +2.50

    She's in a physio short so I want to get her out of that as well.

    Before I call the MD any thoughts from my peps would be appreciated.
    Last edited by Uncle Fester; 03-04-2020 at 03:04 PM.

  2. #2
    One eye sees, the other feels. OptiBoard Gold Supporter
    Join Date
    Jul 2002
    Location
    Wauwatosa Wi
    Occupation
    Dispensing Optician
    Posts
    4,975
    Frustrating to have some degree usable vision so close. AMD is similar. For this to have any chance to work you'll need a lot of prism to redirect the image, at least 5 to 10 PD BU minimum, probably more. The floor will look uphill, and stairs/steps will be murder. Try before you buy.

    If interference from the right eye is intolerable, consider a clip-on occluder, Fresnel Min occlusion lens, etc.

    Best regards,
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    Science is a way of trying not to fool yourself. - Richard P. Feynman

  3. #3
    Master OptiBoarder optical24/7's Avatar
    Join Date
    May 2006
    Location
    Tx.
    Occupation
    Dispensing Optician
    Posts
    5,397
    Also keep in mind 1D of prism displaces an object only 1/2 degree (exp; 10D displaces an object 5 degrees, ect.) And each prism diopter only displaces the pupil about a third of a mm. They make a Fresnel in 40D that would displace objects 20 degrees (displace pupil about 6.5 mm) But the LCA's would be killer in that much prism. ( Even 10 D, the LCA's are considerable ). But you never know till you try it. I would think Fresnel's would be a better way to experiment since she can wear them on her current glasses instead of a *simulation* thru a trial frame.

  4. #4
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    4,495
    Thanks guys especially for my up down mix up!

    You guys are the best!

  5. #5
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    4,495
    Just dispensed a pair of simple sv cr39 with no obvious improvements so she is coming to realize we've done about all we can refractive wise and the issue is internal.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help with this prism patient
    By mifralick in forum General Optics and Eyecare Discussion Forum
    Replies: 9
    Last Post: 04-06-2020, 10:25 AM
  2. Finicky patient. Prism. New Rx. Comfort out of range. Help!!
    By ak47 in forum General Optics and Eyecare Discussion Forum
    Replies: 21
    Last Post: 11-28-2017, 07:15 AM
  3. Question on patient's reading glasses VD/prism--Help!?
    By suzicoleman in forum General Optics and Eyecare Discussion Forum
    Replies: 10
    Last Post: 06-30-2017, 01:27 PM
  4. Yoked prism dilemma
    By Uncle Fester in forum General Optics and Eyecare Discussion Forum
    Replies: 35
    Last Post: 04-25-2007, 09:38 AM
  5. Patient Prism Woes
    By Jubilee in forum General Optics and Eyecare Discussion Forum
    Replies: 5
    Last Post: 03-02-2006, 11:56 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OptiBoard is proudly sponsored by:
Younger Optics and Vision Equipment