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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
Assuming it's split, 7.5 BO is not that bad especially if it's plano. As far as the different PALs go, I BELIEVE(would love to be corrected if i'm wrong!!!) all lenses will get essentially treated...
Got a patient with three RXs (near, comp, dist)
Dist
-1.00 -1.00 *090
-1.00 -1.00 *090
Comp
PL -1.00 *090
PL -1.25 *090
I just tell patient's to turn on night-shift on their phones or computer screen. To me it is better (actually easier on my eyes) and it's free
I destroy their expectations before I destroy their expectations
I think Hoya made watch parts
SPEAKING OF HIHG-INDEX!!! Whenever you can, MILL YOUR HIGH INDEX! It reduces water waste and smell.
According to my friend getting a doctorate in Math(no I don't know the specific math). You cannot have an equation like Martin's lens tilt that compensates for BOTH the tilt and wrap at the same...
I get that. But in your experience do you think an aspheric full-view-ish lens is better or and egg yolky lenticular? Or is it just random preference?
You would know better than I would about the diameter for the phoroptor.
So the question remains: should we try to reproduce a the phoropter lens a close possible?
So if that's a thing, then that kind of blows up what this article was saying about the drop just being kind of a whim of the designer with no real effect on the other attributes of the lens.
for sure, I get it being at a 3-4 since that's what most panto calls for. I guess I'm stumped when it goes beyond that range into the 0s,2s,6s.
"The drop of a progressive lens is not in and of itself a design element, and it is not directly related to either the progressive profile or placement of unwanted cylinder power. It is, quite...
Yes indeed all of this was taken into consideration. The patient has severe structural ocular conditions which make it seem that no Rx is really going to be perfect. We went with the standard 12mm...