Results 1 to 16 of 16

Thread: Free Form & Prescribed Prism

  1. #1
    OptiBoard Apprentice Steelerfan's Avatar
    Join Date
    Nov 2004
    Location
    Corning, NY
    Occupation
    Dispensing Optician
    Posts
    29

    Free Form & Prescribed Prism

    Does anyone have any recommendations for what type of progressive may work better than another when it comes to a long time base out prism wearer and his first plunge into getting a progressive?

    Here's the RX:

    OD -1.75 -0.50 x 180 4 base OUT

    OS -2.75 sphere 4 base OUT

    Add +2.25

    PD 31/31

    I'm using a frame with a PD of 69. Thinking about 1.67 index with A/R and some type of free form progressive. Cost is less important than the best possible vision for this client. I've heard great things from Craig about the Kodak Unique and am eager to try it. Think this would be a good candidate?

  2. #2
    Bad address email on file
    Join Date
    Dec 2006
    Location
    Florida
    Occupation
    Dispensing Optician
    Posts
    2,175

    I need more information!

    Quote Originally Posted by Steelerfan View Post
    Does anyone have any recommendations for what type of progressive may work better than another when it comes to a long time base out prism wearer and his first plunge into getting a progressive?

    Here's the RX:

    OD -1.75 -0.50 x 180 4 base OUT

    OS -2.75 sphere 4 base OUT

    Add +2.25

    PD 31/31

    I'm using a frame with a PD of 69. Thinking about 1.67 index with A/R and some type of free form progressive. Cost is less important than the best possible vision for this client. I've heard great things from Craig about the Kodak Unique and am eager to try it. Think this would be a good candidate?
    It is not available in a Kodak unique at this time, but I am checking a few sources and need to know the B and ED to get an answer. I am rather sure Pech Optical can do it in an Autograph 1.67.
    Craig

  3. #3
    OptiBoard Apprentice Steelerfan's Avatar
    Join Date
    Nov 2004
    Location
    Corning, NY
    Occupation
    Dispensing Optician
    Posts
    29

    Ed & B

    Craig,

    The ED of the frame is 50mm and the b dimension 34mm

  4. #4
    Bad address email on file
    Join Date
    Dec 2006
    Location
    Florida
    Occupation
    Dispensing Optician
    Posts
    2,175

    Wave This job can be done at Pech Optical!

    The job can be done in a 1.67 Autograph with the prism required. My experience tells us that folks with Prism get a huge benefit from free form lenses. I have already spoken Mary and she will await your call or email to get this built. I look forward to hearing back from you.

    Mary DeJong
    Pech Optical
    Solutions and Technical Assistance
    800-831-2352 ext 577
    mary@pech.com

    Craig :idea:

  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
    5,303
    What were they in before? That's a lot of add for a newbie let alone the prism issue.

    I'd also suggest taking a pen and have the patient focus on it at arms length then bring it forward to see if you get any convergence before verifying with the pupilometer.

    I'd be very leery of putting this Rx in progressives.

    My 2 cents.
    Regards

  6. #6
    Underemployed Genius Jacqui's Avatar
    Join Date
    Oct 2003
    Location
    Frostbite Falls, Mn.
    Occupation
    Optical Wholesale Lab (other positions)
    Posts
    7,417
    Quote Originally Posted by Uncle Fester View Post
    I'd be very leery of putting this Rx in progressives.

    I agree

  7. #7
    Master OptiBoarder OptiBoard Gold Supporter DragonLensmanWV's Avatar
    Join Date
    Oct 2006
    Location
    The Greatest Nation
    Occupation
    Optical Retail
    Posts
    7,645
    Quote Originally Posted by Uncle Fester View Post
    What were they in before? That's a lot of add for a newbie let alone the prism issue.

    I'd also suggest taking a pen and have the patient focus on it at arms length then bring it forward to see if you get any convergence before verifying with the pupilometer.

    I'd be very leery of putting this Rx in progressives.

    My 2 cents.
    Regards

    Look at the RX. How many -2.50 or abouts have held off way too long on multifocals because "I can take my glasses off and see perfectly!"
    If this is their first multifocal, go with the progressive, might as well get used to it if they gotta get used to something.
    Fester does have a good point about their convergence.
    I would maybe suggest the Unique in 1.60.
    DragonlensmanWV N.A.O.L.
    "There is nothing patriotic about hating your government or pretending you can hate your government but love your country."

  8. #8
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    5,303
    Quote Originally Posted by DragonLensmanWV View Post
    If this is their first multifocal, go with the progressive, might as well get used to it if they gotta get used to something.
    Only if Ryser's Rule (Equation) applies!:cheers:

  9. #9
    Bad address email on file Freedom's Avatar
    Join Date
    Feb 2006
    Location
    THAILAND
    Occupation
    Optical Retail
    Posts
    78
    You must adjust PD. in horizontal

    Prism x 0.3 =4 x 0.3 = 1.2 mm.

    In this case is baseout ... must decrese PD
    equal 31-1.2 = 29.5

    PD 29.5/29.5

    GoodLuck

  10. #10
    Master OptiBoarder
    Join Date
    Apr 2006
    Location
    NA
    Occupation
    Dispensing Optician
    Posts
    1,255
    Quote Originally Posted by Uncle Fester View Post
    Only if Ryser's Rule (Equation) applies!:cheers:
    What's Ryser's Rule?

  11. #11
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    5,303

    Ryser's Rule...

    Quote Originally Posted by EyeFitWell View Post
    What's Ryser's Rule?
    It's my attempt at immortalizing Chris Ryser's name in the optical world!

    If you get to know him and his view on progressives you'll come to see he is not a big fan of progressives when compared to bi's or tri's. Over time many of us on the Optiboard have come to see the wisdom in his teachings so I coined the term with the following definition:

    Ryser's Rule- The success of fitting a progressive is directly proportional to the motivation of the person to wear a progressive.

    Nobody's been able (or willing?) to put this into a mathmatical formula (or maybe one already exists outside of optics) but I think you'll agree we deal with it all the time!
    Last edited by Uncle Fester; 07-17-2008 at 10:27 PM. Reason: tweak...

  12. #12
    Bad address email on file
    Join Date
    Jul 2008
    Location
    Australia
    Occupation
    Lens Manufacturer
    Posts
    3
    Hi Steelefan

    I have successfully worked a total of 9 dioptres of prism in a Hoyalux ID. My patient loved this decision to go with this progressive len. He was an experienced multi wearer adpated instantly and enjoyed the full benefits of the Hoyalux ID. Frame dimensions needed to be taken into account and ep measurements before i ordered.

    cheers

  13. #13
    OptiBoard Apprentice
    Join Date
    May 2007
    Location
    NYC
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    12

    Confirmed in Autograph/Seiko Succeed/Indo Lifemade

    The Rx provided is avl. in both 1.67/1.60 in all THREE Freeform designs.

  14. #14
    Bad address email on file
    Join Date
    Jul 2008
    Location
    Indiana
    Occupation
    Optical Laboratory Technician
    Posts
    15
    Stick with the 1.67 index you had in mind, and anything with free-form. Prescribed prism seems to have a better effect on the patients eyes through a free-form lens.


  15. #15
    OptiBoard Apprentice
    Join Date
    May 2007
    Location
    NYC
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    12

    1.60

    To give your chance for best result choose 1.60 / it offers a better abbe value. This of course can not be disputed.

  16. #16
    Master OptiBoarder
    Join Date
    Apr 2006
    Location
    NA
    Occupation
    Dispensing Optician
    Posts
    1,255
    Quote Originally Posted by Uncle Fester View Post
    Ryser's Rule- The success of fitting a progressive is directly proportional to the motivation of the person to wear a progressive.

    Nobody's been able (or willing?) to put this into a mathmatical formula (or maybe one already exists outside of optics) but I think you'll agree we deal with it all the time!
    S=M/C

    S= Success
    M=Motivation
    C=Constant for the chosen progressive lens based on it's performance in Dr. Sheedy's studies.

    How's that?

    :cheers:

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Base OUT prism & Free Form
    By Steelerfan in forum Ophthalmic Optics
    Replies: 1
    Last Post: 06-21-2008, 02:19 PM
  2. free form progressives and slab off prism
    By Daniel Cunningham in forum General Optics and Eyecare Discussion Forum
    Replies: 2
    Last Post: 03-03-2007, 05:56 PM
  3. Fitting PALs with prescribed prism
    By Joann Raytar in forum Ophthalmic Optics
    Replies: 6
    Last Post: 10-28-2006, 01:00 PM
  4. measuring prescribed prism ...
    By mirage2k2 in forum General Optics and Eyecare Discussion Forum
    Replies: 9
    Last Post: 04-26-2006, 10:34 PM
  5. Free-form, schmree-form...
    By drk in forum General Optics and Eyecare Discussion Forum
    Replies: 7
    Last Post: 03-31-2004, 08:43 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
  •