Results 1 to 8 of 8

Thread: SV and Ft-28 visual difference

  1. #1
    OptiBoard Novice
    Join Date
    Sep 2017
    Location
    Ohio
    Occupation
    Dispensing Optician
    Posts
    1

    Confused SV and Ft-28 visual difference

    Currently have a pt that has a DVO pair, trivex, photochromic, Crizal Alize, and a FT-28 pair, trivex, photochromic, Crizal Alize. Both pair are in the same style frame and adjusted the same as well. Pt is complaining that the DV in the SV is much better than the FT-28 pair. My mgr and I have tested the base curve, warpage and the prescription itself. Everything checks out. We are at a loss. Any help would be appreciated.

    The Rx is from August 2020 and the only change was the add power from +2.00 to a +2.75. The SV was purchased in August 2020 and the FT-28 was purchased in January 2021.

  2. #2
    What's up? drk's Avatar
    Join Date
    Mar 2004
    Location
    Ohio
    Occupation
    Optometrist
    Posts
    8,185
    It would have to be either psychological or some defect in lens quality. Maybe put him on an eye chart, monocularly, see if you can do a comparison between pairs and see if his subjective complaint can be "objectified"?

  3. #3
    Master OptiBoarder optical24/7's Avatar
    Join Date
    May 2006
    Location
    Down on the Farm
    Occupation
    Dispensing Optician
    Posts
    5,471
    Was there a seg hgt. Change? Is there any buildup of hardcoat at the seg line under the AR? It could also be the +.75 bump is adding more blurr in lower peripheral viewing. Definitely check acuity between the 2 as drk suggested. I doubt it’s psychological if the patient successfully wore ft’s in the past.

  4. #4
    Master OptiBoarder OptiBoard Silver Supporter
    Join Date
    Feb 2016
    Location
    usa
    Occupation
    Dispensing Optician
    Posts
    626
    Is the SV aspheric and the FT spherical? Was the proper OC height specified in the FT pair along with the seg height?

  5. #5
    OptiBoard Professional
    Join Date
    Jul 2016
    Location
    California
    Occupation
    Optical Wholesale Lab (other positions)
    Posts
    130
    Check the off center optics in the ft. Move the lens horizontally and vertically in the lensometer and observe if there is any dramatic change in power do to poor surfacing techniques.

  6. #6
    Rising Star OptiBoard Silver Supporter Optical Roy's Avatar
    Join Date
    May 2019
    Location
    Nacogdoches Texas
    Occupation
    Dispensing Optician
    Posts
    93
    What's the Dist RX?
    Roy W. Jackson, Sr. ABOC

  7. #7
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    4,711
    Welcome to Optiboard halsey1977!!!

    What is the distance prescription?

  8. #8
    Master OptiBoarder OptiBoard Silver Supporter
    Join Date
    Jan 2007
    Location
    Massachusetts
    Occupation
    Dispensing Optician
    Posts
    1,312
    [QUOTE=Is there any buildup of hardcoat at the seg line under the AR? It could also be the +.75 bump is adding more blurr in lower peripheral viewing..[/QUOTE]

    That's what I'm thinking

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. What's the difference between a 6es and the 7e ?
    By Gsxray24 in forum General Optics and Eyecare Discussion Forum
    Replies: 0
    Last Post: 09-21-2019, 01:22 PM
  2. Difference in RX OU
    By Now I See in forum General Optics and Eyecare Discussion Forum
    Replies: 44
    Last Post: 04-27-2013, 12:20 PM
  3. How to tell the difference ?
    By npk in forum General Optics and Eyecare Discussion Forum
    Replies: 18
    Last Post: 07-16-2009, 10:24 AM
  4. what's the difference?
    By Now I See in forum Progressive Lens Discussion Forum
    Replies: 19
    Last Post: 05-06-2009, 12:43 AM
  5. What is the Difference?
    By dioptical in forum Progressive Lens Discussion Forum
    Replies: 11
    Last Post: 03-27-2008, 06:44 AM

Tags for this Thread

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