Some great discussion here. Thank you.
Type: Posts; User: drk; Keyword(s):
Some great discussion here. Thank you.
Ultimately, we have positioned it as a tint, or the old-style UV coating. We will use AR with it (as we should on virtually all lenses.)
In the end, with our fee schedule, the patient pays a...
I'm now under the impression that the "invisible" blue blocking is probably imbibed on the front surface like photochromics, and there are treated blanks that are required.
Examples of "in mass"
https://www.zeiss.com/vision-care/us/need-new-eyeglasses/blueguard.html
https://shamir.com/for-professionals/lenses_and_more/shamir-blue-zero/...
Blue light protection is a scam. In all my many years I've never seen such a delusion take hold. It speaks to the "disinformation age" in which we find ourselves. (Editorial comment.)
1. Blue...
Beer goggles.
Thank you Uilleann.
It's "just" a inverted triangle design. It seems those designs are intermediate-optimized.
If the near zone is wide enough, I guess it would work for general purpose.
If you can get into a good OD school, and you are willing to consider different places to live, and you don't go into too much debt, it's still a good profession.
Problem #1 is monocular PALs. What the fresh hell is that?
Problem #2 is first time PALs with a full add. That's always hard.
Your best bet would be just segmented BF with equal BC and CT. ...
Good questions.
First lens design. I would agree that a wider, more prominent seg is smart.
Re: centering the optics...
a. If high power lens, it's for the better central optics.
b. I...
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSfuU6rSXa3RcjaeNANrtjSHgczBEM00OLiZ74CsxgjNea4QlzAkCZmPFvabLXcc0POVNk&usqp=CAU
Another take-home point is that we don't have to worry about the prism amounts that are used for the typical phoric conditions (2^ BI, etc.). But for the mega-prism situations (shudder) like 6^BO...
The synthesis:
Poly, while a good low-power lens material, is not as good for higher powers due to chromatic aberration, especially for higher plus powers, where trivex will do better, visually.
...
... we see for a poly lens with Abbe of 30, powers of +4 and above have lateral color errors of more than twice that of our 0.12 threshold...At those levels, some observers would find it bothersome. ...
Plus Vs. Minus Powered Lenses
plus lenses yield more lateral chromatic aberration than minus lenses of identical power.
This is because of the front surface curvature and thickness of the lens,...
Just Observable Error For Lateral Color
“ we know that 5 Diopters of prism introduces enough lateral color to cause about the same amount of blur as does 0.12 diopters of power error…
There is...
https://www.2020mag.com/CMSImagesContent/2015/9/Refractice-Index-chart-for-Poly_web.png
"The outlier"
https://www.2020mag.com/CMSImagesContent/2015/9/Lens-Material-Chart---Dick-Whitney_web.png
https://www.2020mag.com/article/does-material-abbe-value-influence-your-patients-vision
It sounds unlikely to me that it has anything to do with corneal curvature.
Optimized for hyperopes probably has to do with the softness feature.
Intended for CL wearers is baffling. Maybe...
(No experience to contribute, sorry.)
I don't think that's likely. And I don't know how a patient would be able to legitimately say "Oh, I KNOW I saw better through the doctor's thing-a-ma-jobby than through these coke-bottles!"
I...
Traditional numbers say 8 exams x 5 days x 50 weeks = 2000/yr
Need about 6000 for a good patient base.
I have Welch-Allen and it's boring and standard. I'm very happy with it.
"Seeing better in the chair" is sometimes an unavoidable situation. How small are phoroptor lenses? 20 mm? And glass.