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Here are some pictures that might help you visualize it better. 2 are 3d renderings to help with the visualization of what is happening, and 2 are just 2d to look at the math. I made these in plano...

Am I taking crazy pills? Are you talking about comment #12?

Lets just agree to leave the "I had to learn with a slide rule after I walked uphill through 3 feet of snow backwards to school" BS at the door OK?

I think the point you are trying to get across...

You seem to have answered you own question? I'm not sure what else I can add. The cylinder power is the difference between the principal meridians, 5 diopters. In this case it's -5.00 because we all...

I'm pretty sure this happened Jan 1 of 2019. Zeiss moved all freeform lenses and coatings in house. Why would you even bother trying to get Zeiss lenses if you hate them so much?

You've lost me. How does the power go from +5.00 to 0.00 is the cylinder doesn't have any power?

A more detailed response can be found here, in post #22, strangely enough in response to your own...

Take the two parts separately. 5.00 sphere decentered in 10 mm gives you 5D BI prism. Then do the cylinder. Prism created by decentering a cylinder requires a little trig or graph paper. A -5.00...

If you can't make a ribbon seg work, you could suggest they get contact lenses corrected for distance vision, then go back to a st28, plano top, with a narrow b frame they can look under.

Feel free to continue to be naive Barry. But when my remake rate is far, far lower than 15-17% it's just reality for me.

They already do, it's called raising the price, the "free" remakes are already factored into the labs bottom line. Labs are smart enough to know that most opticians aren't smart, and most doctors are...

And on the other hand you can get a tattoo that says "your glasses won't be any better than your last pair because I'm afraid I might have to do some troubleshooting and actual optical work"

[BoB] "why don't my fandangled new Varylexus work on the computer? The last pair I got 8 years ago work great on the computer, I just want to be able to see a little better when I'm driving. So make...

Hey, you do you Drk, don't let me stop you. I usually spend quite a bit of time asking them about their specific situation and explain the difference in lens types I can make for them. I don't think...

Of course, then I speak to them about occupation or computer glasses. Why don't you want to call them computer glasses?

I don't get it? why?

Why not buy directly from the contact lens manufacturers?

You can just drop the cord in the dye pot for a bit and make whatever color cord you want.

I don't think you are correctly applying Prentice's Rule if you think it doesn't work for your example.

Vertical prism is induced when horizontally decentering a cylinder. You can calculate it...

Here is the layout chart for anyone interested in the nostalgia.

14803

It was definitely called the Overview, and it was made on the Varilux Plus(which I think is the same as the Varilux 2?) design.

Glad you can revel in others misery Don. Do you make posts that aren't self serving?

I would be weary of posting things from hearsay sources no matter how knowledgeable. The NIH has said

"Although viruses don’t grow on any non-living surfaces, recent studies show Corona viruses...

Hey, I appreciate it when people share their thoughts on subjects. it makes it much easier for me to figure out what people and companies to avoid at all costs. Just because there are a wide range of...

Yeah I can tell they are real. I was just a bit surprised someone from this board would promote or support using them.

This is sarcastic right?