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How would Hoya factor into this?

could you enlighten us as to what the main differences are? Btw, times like this I wish the lens guru site was still up

yes yes, there are two discussions happening. So yes, it would be MY responsibility to ask for a correct PD based on the rules laid out in Systems. It’s then the lab’s responsibility to make that PD...

Okay hold on.

So, in the case of a complete job, in order for it to come out with the correct PDs you need to compensate before blocking them, correct?

yessss...,. but if I order a 30/30 pd with a 10 BO prism on both sides, and the lab DOES NOT do the compensation calculations, then on final inspection the PD will be incorrect. Hence, it is the lab...

no, the lab should do this because if they don't then it will not pass final inspection since the PDs or segs will be wrong.

And it should be compensated using the same formula? 0.33 times the prismatic power in the opposite direction of the base?

Heyyyyy!!! thank you! where did this image come from btw?

So the first one with the ring actually fits better that the slanted one pictured. Also, the Laramy K video does not mention the machine having any control over the angle of the shelf.

I have two jobs. One has a direct 90 degree step around the lens. The other one was slanted. I wanted to explain to the lab what I wanted but I realized I lacked the vocabulary for it.

The first...

Yes, there are things called rouge that you need to buy. I would google what to use for a polish like you want. the wheels last a long time, I would replace once they look really worn out

ahhhh. Very interesting. Is there anything that mentions whether one is better (even if just marginally) than the other? Also, is there any chart that says something to the effect of "if you deviate...

Yes, I reference this often and it is where I pulled the ellipse image from. I think what I am looking for is the basis of Ostwalt's work and how it relates to Wollaston's. In this article it just...

https://www.homedepot.com/p/VEVOR-Corded-Bench-Buffer-Polisher-8-in-350-Watt-3-4HP-3600-RPM-Benchtop-Lathe-Polishing-for-Jewelry-Wood-Silver-Amber-Metal-YCPGJMC8110VWC39IV1/329400047?source=shoppingad...

From the enigma post
"The lower (Ostwalt) branch of Tscherning's ellipse serves as the basis for modern "best form" spectacle lenses. Both branches can eliminate oblique astigmatism, but Wollaston's...

AN ENIGMA

man! here's something interesting from that post

15552


[/QUOTE]

So I've always wondered.... What is up with the W. Wollaston base-curve lens series? It gets mentioned in almost any base curve tutorial without any further satisfactory explanation. You mean to...

Wooo boy this "white paper" is wordy AF. This feels like when you have a paper do and you need to pad the word count.

This assumes a +2.50 add correct? So If it's like a +2.25 add then shave off a quarter from all those powers you listed?

I'm going to crack that open as soon as I get home!

So IIRC 1 prism diopter will move an object 1cm at 1meter. that works on both sides of the lenses, but I thought it was only a cosmetic thing. wtf. Somebody needs to draw this out

So to be clear if I had a patient with a 5 BU and a 5 BD pal rx I would move the right lens down about 1.5mm and the left lens up about 1.5mm. And this is something that is done every time, correct?

oh daaaaang.... two questions:

what about opposing prisms in each eye (one up and one down) and single vision lenses?

hmmmmm.... In my case I would def call the doc. In my head I think of this as 15 total base out. But you've probably already called the doc. And in that case, ya gotta call around and just see what's...

Nope, older lady whom, up until this point, has had the same cyl prescribed in the twenty or so pairs we have made