Results 1 to 3 of 3

Thread: Please help with prism question

  1. #1
    OptiBoardaholic Ineed Chocolate's Avatar
    Join Date
    Nov 2006
    Location
    Washington DC Metro area
    Occupation
    Dispensing Optician
    Posts
    208

    Confused Please help with prism question

    OK, call me stupid, but it's been so long, I can't remember this...we have a new auto lensometer (Alcon) in our office and I am cutting a SV job with 2 diopters of base down prism in the OD and 2 base UP in the OS. I laid out the lenses with the correct amount of prism in the correct direction (it has a digital read-out) and marked them up.l I then blocked them and edged them, and put them back into the lensometer to check them. My question: Where should the O.C. location be on these lenses? The OD is right at the 180 line, and reads 2 base down...and the OS on the 180 line reads NO prism, and if I line it up so the lens is reading 2 diopters base up, as specified, the O.C. dot in way down at the bottom of the lens. Is any of this making sense? Thanks for your help!:hammer:

  2. #2
    Banned
    Join Date
    Jun 2000
    Location
    Only City in the World built over a Volcano
    Occupation
    Dispensing Optician
    Posts
    12,996
    Sounds like you laid one of them out wrong. The O.C. distance is gonna depend on how much power the lens(es) have. Are they both plus or both minus, is one plus and the other minus. Are the both the same power. You will need less decentration on strong lens powers and more on weak ones.

    Chip

  3. #3
    Bad address email on file
    Join Date
    May 2008
    Location
    Passaic, New Jersey, United States
    Occupation
    Dispensing Optician
    Posts
    178
    Check your strongest lens at the 90 degree meridian first , Although if you marked them correctly from the beginning, this wouldn't make a difference I don't think.

    good luck!

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Question about prism
    By Neophyte Optician in forum Ophthalmic Optics
    Replies: 14
    Last Post: 12-06-2007, 04:13 PM
  2. Prism question
    By Iakwin in forum Ophthalmic Optics
    Replies: 7
    Last Post: 06-06-2005, 12:34 PM
  3. Prism question
    By lainw in forum Ophthalmic Optics
    Replies: 18
    Last Post: 06-18-2003, 02:30 PM
  4. Pt question regarding Prism
    By loqui in forum General Optics and Eyecare Discussion Forum
    Replies: 4
    Last Post: 03-30-2002, 10:26 AM
  5. Prism question
    By Pam in forum Ophthalmic Optics
    Replies: 9
    Last Post: 10-07-2000, 02:44 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
  •