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Slab-Off Pal
Anyone here ever dispense a Slab-off PAL? Our lab says it can be done on non-digital progressives, I've only done a handful of FT28 w/slab off so I'm not sure what a good traditional progressive designs would be for this patient...patient is in a zeiss choice progressive currently.
RX is
-1.75 -0.75 x112
+3.00 -4.50 x090
+2.50
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I have but critical measure will be reading depth. Typically for FT 28 10mm is used. Determine reading gaze based on PRP. For the few I did, 12 to 14 mm was used.
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With a +2.50 add if this is a FT conversion to a first time progressive.....
JUST DON"T DO IT! :eek:
If you must- charge big, big bucks (I'd be in the $1,000 range) and put them in the best Zeiss (if that's what you deal with) available to compensate for the high cyl's axis shift necessary for the downgaze, and with a short corridor. Even then forewarn them that the intermediate may still not work.
I'll defer to others with more experience if they have another suggestion but I would do everything I could to talk them out of this tar-baby you are about to embrace.
But then again- who knows if Ryser's Rule will work!
Be sure to have them sign a waiver that there will be no refund if/when it fails.
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This patient is a seasoned progressive wearer but I'm going to try to talk her out of it, since it sort of defeats the purpose and aesthetics of a progressive lens. We shall see. Thanks everyone for your advice.
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You might want to hold a trial base up prism to the right(?) eye of an existing pair of progressives- or get a Fresnel for them to trial.
They may be using them monocularly and the slab prism will open a can-o-worms.
Why are you fixing what isn't broken? Or is this request coming from the patient?
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US Optical has done them for me before, using IOT PALS Worked well and wasn't super expensive.
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Shaw lens, if you can get it.
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It can be done on any digital progressive, the lab just has to put the slab on the front. Younger makes cast slab blanks which could also be used. ( I am not sure they still make the product)