Results 1 to 8 of 8

Thread: OD -30.00 sph. OS balance Single Vision

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

    Angry OD -30.00 sph. OS balance Single Vision

    :angry: RX is as follows...

    OD -30.00 sphere
    OS balance

    Single Vision.

    What is the absolute highest lens power available? Are there ANY options on this other than plastic ?

    Tell me more ?

  2. #2
    Rising Star jimrask's Avatar
    Join Date
    Feb 2010
    Location
    Tervuren, Belgium
    Occupation
    Optometrist
    Posts
    59
    You could try asking Zeiss if they can make you this in 1.90 Lantal (glass), will be extremely expensive and really easy to break :s
    or a lenticular in 1.70 plastic, also quite expensive.

  3. #3
    Master OptiBoarder
    Join Date
    Mar 2008
    Location
    Oakland, California
    Occupation
    Dispensing Optician
    Posts
    1,573
    I've said this before in other threads: DO NOT use 1.9 glass on a patient with only one eye. Don't. No. No.
    A lenticular G (myodisk) is your best bet, should be do-able in many materials including poly or Trivex.

  4. #4
    Doh! braheem24's Avatar
    Join Date
    Feb 2001
    Location
    KOCF & 89ft ASL
    Occupation
    Other Eyecare-Related Field
    Posts
    3,843
    Why are you upset? I would consider it an honor for the opportunity...

    Forget the material and concentrate on the frame. I've made a -26.50 in 1.67 with 1mm decentration that looked very presentable. A wide dbl, protruding end pieces, oval shape and zero decentration should be the main goal. I would opt for 1.70.

    This would be the shape I would shoot for...

    Last edited by braheem24; 03-19-2010 at 07:23 PM.

  5. #5
    Banned
    Join Date
    Apr 2009
    Location
    USA
    Occupation
    Optical Retail
    Posts
    385
    I can't believe poly was even considered as a response the abbe would be horrible. I would personally go with a Polycore 1.71 lenticular. If you do the math:

    0.25 Base lens (tool)
    0.25 * 0.71/0.53 = 0.33D (material)
    30.00 - 0.33 = 29.67D Back Curve (thickness won't change this too much due to the low front curve power)

    The radius on that curve 0.71/29.67 = 24mm that is one steep radius, a lenticular is limited to an aperture of 48mm or smaller to begin with and the 48mm would require a thickness of 24mm. Evan a aperture of 30mm would be 6.2mm thick.
    (center thickness of 1.2mm according to manufacturers specs)
    30mm = 6.2mm
    35mm = 8.8mm <-- My preference, myope have an extended field of view so a smaller aperture would work out
    40mm = 11.9mm
    45mm = 16.8mm

    And don't let the AR be optional either, it is a crazy definite must. braheems suggestions about frames and decentration were right on the money too, stick to as close to zero decentration as possible and smaller eye size to reduce thickness.

  6. #6
    Underemployed Genius Jacqui's Avatar
    Join Date
    Oct 2003
    Location
    Frostbite Falls, Mn.
    Occupation
    Optical Wholesale Lab (other positions)
    Posts
    7,417
    I've made them, actually all the way to -35.00. Use the 1.70/1.71 material and do it as a myodisk, that will reduce some edge thickness. Otherwise follow almost everyone else's suggestions.

  7. #7
    Independent Owner kcount's Avatar
    Join Date
    Feb 2009
    Location
    Chicago, Illinois, United States
    Occupation
    Dispensing Optician
    Posts
    1,718
    Sounds like a lens for Awtech to make. Look him up in the members list. I'm sure he would have some great ideas.
    • Optician
    • Frame Maker/Designer
    • Teacher of the art of crafting handmade eyewear.

  8. #8
    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 kcount View Post
    Sounds like a lens for Awtech to make. Look him up in the members list. I'm sure he would have some great ideas.
    And why can't someone else make them?? It's not that hard, just think a little bit. I do things like this and high prisms, hemianoptics and Franklins all the time. Plus sometimes I even make frames to put them in.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Best Single Vision
    By charan in forum General Optics and Eyecare Discussion Forum
    Replies: 9
    Last Post: 02-19-2010, 10:09 AM
  2. autograph II single vision?
    By Ecliptic in forum General Optics and Eyecare Discussion Forum
    Replies: 4
    Last Post: 06-24-2009, 10:13 AM
  3. Polycarbonate Single Vision
    By DocInChina in forum Optical Marketplace
    Replies: 0
    Last Post: 01-12-2005, 05:55 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
  •