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Thanks for all the input. I'm not bothered by it really; if something is within tolerance I know there's the tolerance limit for a reason. I just want to get a more comprehensive knowledge about...

Mostly essilor fsv lenses. But again it's never been out of tolerance. They've always been below .33 prism diopter. Also, I hate poly too, I'm wearing crown glass at the moment.

Thank you, that's an excellent, comprehensive answer. I'll experiment with our process to see if I can isolate any particular reason why there might be small amounts of unintended prism. It's always...

I can understand that with lenses generated in the lab from semi-finished blanks, because if it's blocked slightly off center or the generator isn't calibrated properly that can lead to things like...

No not any compensated rx or anything. So there's no reason for there to be any prism. Just a ground lens with no power, or a finished lens with no power in one or both principal meridians. Seems...

Could anyone help me understand why plano lenses often have some unintended stationary prism? Even when only one principal meridian is plano in a toric lens there is usually a tolerable amount of...

Hello everyone. I am still an apprentice and would like to supplement my on job training and personal study with formal education. I would like to someday work with lens design and optical...

I know these posts are from a long time ago, but I'd like to add something. I personally have moderate hyperopia with a quarter cyl in both eyes and can tell the difference without the cyl. My vision...

So an aspheric base curve on a semi finished lens that isn't digitally optimized on the back side is basically for a thinner lens? Not for better peripheral vision?

So essentially the distortion in power I'm seeing is because of an incorreCT base curve? The prescription is +1.75 -.25 156, on a 4 base, so a higher base curve would be a better choice? I'm still...

Hello, I am an optician apprentice and lab technician in lenscrafters, (at least until they close all the labs soon) and I have a question about aspheric lenses. I am a hyperope, so I'm sure you all...