Results 1 to 9 of 9

Thread: Free Form Materials

  1. #1
    OptiBoard Professional skirk1975's Avatar
    Join Date
    Oct 2002
    Location
    California
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    187

    Blue Jumper Free Form Materials

    Why are free form lenses available in inly hi-index materials? Does this make any sense since CR39 is the clearest of materials to begin with? The answer I got from one rep of a company with a free form product is that CR39 is clear enough as it is so it doesn't need the free form as much as the 1.60 or 1.67. That answer is somewhat ridiculous. What does anyone else have to say about this ? :angry:

  2. #2
    Underemployed Genius Jacqui's Avatar
    Join Date
    Oct 2003
    Location
    Frostbite Falls, Mn.
    Occupation
    Optical Wholesale Lab (other positions)
    Posts
    7,417
    I've seen all materials except glass done as freeform. I think it may be a more apparent improvement with the higher index materials.

  3. #3
    Allen Weatherby
    Join Date
    Jun 2004
    Location
    Florida
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    1,286

    Free form materials

    This non-spherical finishing process is possible on any material. This is the way the progressive molds are now made for injected lenses. The steel used for molds takes a great deal longer to machine. CR-39 is used but the optical clearness of the material is not a reason to use this type of technology. I think you will see the high indexes used with this process because this is a premium process and to make the thinest lenses the higher indexes accomplish this. I will not be very easy to see a patient on this technology if you are replacing a Poly PAL with a CR-39 free form PAL and charging a lot more for the product. The customer would then look at each product and say the free form is thicker and heavier, Why? There is not a good answer. Free from technologies need to be used where they will offer the greatest benefit to the patient. Price vs. technology is going to have to be figured into the mix.

  4. #4
    OptiBoard Professional
    Join Date
    Apr 2005
    Location
    San Diego
    Occupation
    Dispensing Optician
    Posts
    234
    what exactly is free form guys?

  5. #5
    Master OptiBoarder
    Join Date
    Jan 2005
    Location
    Back in NYC.....Shenzhen, China and Hong Kong
    Occupation
    Other Optical Manufacturer or Vendor
    Posts
    1,155
    Quote Originally Posted by rolandclaur
    what exactly is free form guys?
    There was a thread about free form:

    http://www.optiboard.com/forums/arch...hp/t-9341.html

    Doc

  6. #6
    Rising Star
    Join Date
    Nov 2004
    Location
    canada
    Occupation
    Dispensing Optician
    Posts
    97
    I have a freind in the UK who sent me a pkg from Rodenstock "Impression", a family of free form all materials. S.V., Office, sport progressive, sport S.V., Progressive reg, progressive short most in all index, 1.5, 1.6, 1.67, 1.74 and glass op to 1.8. ??????

    Why cant these guys do better in North America???????

  7. #7
    One of the worst people here
    Join Date
    Jan 2004
    Location
    Canada
    Occupation
    Other Eyecare-Related Field
    Posts
    8,331
    A lot of them do it only in the high index materials because it is usually the companies best lens and they want to put it out as the best. Therefore it is available in a high index with AR and only in those specifications.

  8. #8
    Master OptiBoarder rinselberg's Avatar
    Join Date
    Jan 2004
    Location
    Sunnyvale, CA 94086
    Occupation
    Other Eyecare-Related Field
    Posts
    2,301
    I think that the Shamir Autograph is a free-form progressive lens that is available in CR-39, 1.6 and 1.67 - in the United States.

  9. #9
    Master OptiBoarder rinselberg's Avatar
    Join Date
    Jan 2004
    Location
    Sunnyvale, CA 94086
    Occupation
    Other Eyecare-Related Field
    Posts
    2,301
    I think that the (Essilor) DEFINITY progressive would also be available in "hard resin" (CR-39).

    Andrew Karp, 20/20 Online
    http://www.2020mag.com/index.asp?page=3_351.htm

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Free Form Generating
    By skirk1975 in forum General Optics and Eyecare Discussion Forum
    Replies: 17
    Last Post: 11-15-2006, 12:18 PM
  2. Free Form Front and Back Grinding ?'s
    By skirk1975 in forum General Optics and Eyecare Discussion Forum
    Replies: 3
    Last Post: 06-16-2005, 11:47 PM
  3. Free Form & Independent Labs
    By johntricity in forum General Optics and Eyecare Discussion Forum
    Replies: 6
    Last Post: 11-22-2003, 09:41 AM
  4. Replies: 0
    Last Post: 03-21-2003, 02:18 PM
  5. Should cross burning be a protected form of free speech?
    By Joann Raytar in forum Just Conversation
    Replies: 27
    Last Post: 12-14-2002, 05:59 PM

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
  •