Search:

Type: Posts; User: Oscar; Keyword(s):

Page 1 of 5 1 2 3 4

Search: Search took 0.07 seconds.

  1. Replies
    13
    Views
    8,232

    you probably won't get a stamp on an uncut. It's...

    you probably won't get a stamp on an uncut. It's usually applied after edging.
  2. Replies
    6
    Views
    947

    where would i place the plano prism? in between...

    where would i place the plano prism? in between the lens and the blocking screen?
  3. Replies
    6
    Views
    947

    My blocker blocks from the bottom with the front...

    My blocker blocks from the bottom with the front curve laying flat on the table. I thought this type of blocking is supposed to help prevent these types of issues?
  4. Replies
    6
    Views
    947

    Edging High Vertical Prism

    I have a FT35 with 8 up and 8 down prism. I am using an Optronics 3b blocker (lenses are blocked from the bottom). After blocking, I physically check the alignment based on the line on the chuck...
  5. Replies
    2
    Views
    887

    Thank you

    Thank you
  6. Replies
    2
    Views
    887

    Formula for axis power conversion

    Hello, does anyone remember what the formula is to calculate the power at a specific axis?

    Was it Sphere + cyl (sin squared theta)

    theta = difference between desired axis vs given axis?
  7. Replies
    5
    Views
    1,428

    Thank you everyone this makes a lot more sense....

    Thank you everyone this makes a lot more sense. So will this actually be an issue for people who do not have symmetrical axes? What do we do in those cases?
  8. Replies
    5
    Views
    1,428

    Prism Reference + Oblique Astigmatism

    Just looking for some insight on PRP and induced prism. Let's say I have an Rx at -5.00 and my lens has a drop of 5mm to the PRP. That would be 0.5 x 5 = 2.5 base up induced prism at the pupil...
  9. Replies
    8
    Views
    12,189

    Sorry to resurface this topic. How does it work...

    Sorry to resurface this topic. How does it work when sending a patient their own glasses from Canada to the US? I have a pair stuck at customs asking for some drop ball tests but the lab doesn't do...
  10. Thread: Reverse Slab

    by Oscar
    Replies
    7
    Views
    1,726

    thanks

    thanks
  11. Thread: Reverse Slab

    by Oscar
    Replies
    7
    Views
    1,726

    Maybe I used the wrong terminology or does it...

    Maybe I used the wrong terminology or does it have to do with how the prism is calculated? The dr was just asking it on the lower minus instead. ex
    -1.00
    -6.00

    They want it on the right eye...
  12. Thread: Reverse Slab

    by Oscar
    Replies
    7
    Views
    1,726

    Reverse Slab

    How are these made these days? I was under the impressions that digital surfacing allows for this to happen on the back surface without having to order a special semifinished blank?

    My lab can...
  13. Replies
    5
    Views
    1,247

    Thanks all. I like the idea of placing plano...

    Thanks all. I like the idea of placing plano prism to neutralize the effect. Just need to have a bunch of high prism lenses made now... Also how do you align everything perfectly seems like quite a...
  14. Replies
    5
    Views
    1,247

    Blocking High Power and or High Prism

    Does anyone have tips on blocking high power uncut lenses to get around parallax errors on a blocking machine? Also the thickness from it sitting on the holders and the angle of block placement...
  15. Thread: PAL ID Database

    by Oscar
    Replies
    9
    Views
    2,071

    I received a pair of glasses and was told to...

    I received a pair of glasses and was told to duplicate the height by the Optician :rolleyes:
  16. Thread: PAL ID Database

    by Oscar
    Replies
    9
    Views
    2,071

    has nikon moved to 4 as well? Was 2 when I first...

    has nikon moved to 4 as well? Was 2 when I first started out.
  17. Thread: PAL ID Database

    by Oscar
    Replies
    9
    Views
    2,071

    understandable.. follow up question then.. How...

    understandable.. follow up question then.. How important is the drop? Is there a way to figure it out without knowing what the product is?
  18. Thread: PAL ID Database

    by Oscar
    Replies
    9
    Views
    2,071

    PAL ID Database

    Does anyone have a resource of PAL markings? I have been using one from thevisioncouncil but quite often I run into lenses I have never seen before. Even just to know who manufactured it would be...
  19. whoa this is neat. do the images react the same...

    whoa this is neat. do the images react the same way a topcon / b&l lensmeter would? I want to use it as a teaching aid.
  20. also to note: I am looking for live footage to...

    also to note: I am looking for live footage to demonstrate reading prism and varied cylinder strengths and still photographs will not suffice. I guess a digital SLR with HDMI output would suffice if...
  21. Looking for Camera Attachment for Lensmeter with Live View

    For demonstration purposes, I am looking for a camera attachment that fits onto a lensmeter which can present the image for an audience to observe. Has anyone seen of such devices? I have had limited...
  22. Thread: Hemianophia

    by Oscar
    Replies
    5
    Views
    3,251

    Just an update. I had another patient with the...

    Just an update. I had another patient with the same issue. This patient had no vision on the right side bilaterally. Fit 20D base out fresnel prism on the right half of the lens and they noticed a...
  23. Replies
    26
    Views
    6,987

    Is UV cure used for dip coatings? I thought it...

    Is UV cure used for dip coatings? I thought it was only spincoat?
  24. Replies
    26
    Views
    6,987

    Interesting. I will have to poke the lab about...

    Interesting. I will have to poke the lab about this further. thank you.
  25. Replies
    26
    Views
    6,987

    I get both patients who are obviously lying and...

    I get both patients who are obviously lying and those that I genuinely believe or not mistreating the lenes with this same issue.
Results 1 to 25 of 114
Page 1 of 5 1 2 3 4