1. ## Formula Help

Ok....sorry If This Isnt The Correct Forum For This....

What Is The Formula For Manual Decentration Of Pal Wearer?

Thanks!

2. ## ?

Not exactly sure what ur getting at. but A+DBL=FPD measure B for determine height.

3. Originally Posted by RustyS
Not exactly sure what ur getting at. but A+DBL=FPD measure B for determine height.

FPD, then dived by two, subtract your mono pd=inset

Divide B by two, is the seg height higher or lower, = up or down placement.

Hope this is what your looking for!

4. Originally Posted by Fezz
FPD, then dived by two, subtract your mono pd=inset

Divide B by two, is the seg height higher or lower, = up or down placement.

Hope this is what your looking for!
FPD=68
PPD=58
SEG=17
A=50
B=21
DBL=18.....SO IS THIS CORRECT

68/2=34-29=5(INSET) ?

21/2=10.5-17= -6.5 UP PLACEMENT ?

5. Originally Posted by gogetter
FPD=68
PPD=58
SEG=17
A=50
B=21
DBL=18.....SO IS THIS CORRECT

68/2=34-29=5(INSET) ?

21/2=10.5-17= -6.5 UP PLACEMENT ?
It's right but I hope you're not placing a 17 seg in a 21 B frame and leaving them 4mm for distance;)

6. And I hope that you are taking MONO pds, and figureing your decentration correctly!

7. Originally Posted by Fezz
And I hope that you are taking MONO pds, and figureing your decentration correctly!
Thanks all....

Weird case....pt actually brought in frame and lenses (yes they walked in with uncut pals) and said their optician was now where to be found and he needed his new lenses put in...yada yada yada ...so im going by his requests....and yes he signed a paper stating my lab was not to be held liable for any probs....both on materials and vision...and he did pay a nice lab/materials fee for the service!.....yup....weird!:cheers:

8. ## omg

That would scare the crap out of me. Wondering if i found a real @#\$!!head pt. That another optical kicked to the curb from frustration. Good Luck. That is also a weird scenario. If an LDO put a lens like this in a frame for a pt. (Im sure you verified the lens versus Dr's RX) can the person who edges and dispenses these not be liable. just curious. I did it once for a true friend with lenses from thailand. This was a friend so i did it gratis no paperwork, no liability, and these people were optical folk.

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