Hello folks!
I was looking into estimating lens thickness and I remember that besides the sag height formula, there was another way to estimate it where you can use a constant K-value and...
Type: Posts; User: azhanli22; Keyword(s):
Hello folks!
I was looking into estimating lens thickness and I remember that besides the sag height formula, there was another way to estimate it where you can use a constant K-value and...
Hey folks,
Since being furloughed for the foreseeable future I've decided to take a deep dive into optics. I am now stuck on monochromatic aberration (oblique astigmatism specifically) and was...
Hey folks,
I am taking the ABO-AC test in 3 weeks and I've focused on optical formulas and theories for the longest time. Now I am taking a step back and in rereading the AOT I see that almost...
Hey y'all,
Thanks for all the replies! It definitely helped with clearing up the confusion. It really seems to me that the more I dig into the nitty gritty part of optics, the more confusing it...
Hey folks,
Got a quick questions here. When I was working in a lab a few years ago I remember that that base curve of a lens is always on the convex side of a meniscus lens. And I have only...
Hi Robert,
Oh yes! Sorry for the confusion. I totally forgot that "compensated Rx" have a collection of variables at play. I'm digging through the Optical Formula Tutorials book and their...
Hello folks!
I'm currently studying for the Advanced Test and I want to make sure I have a clear understanding of two different concepts (correct me if I'm wrong please!):
Effective power is...
I've been in this field for about 5 years now and I have worked both in large retailers and private practices. I know from conversation with a lot of my co-workers and some of the posts I've read on...
Hey Robert,
It became much more apparent once I drew out what you said. Thanks!
And further, if I recall correctly, for a plus lens, the closer a lens is to a specified focal point, the more plus power is needed for that lens to achieve the same specified focal point. In that...
Hey folks!
I'm not sure how I have never, ever noticed it but now as I'm looking at the ANSI Z80.1 2015 tolerance I noticed that the Sphere tolerance is based on Sphere Meridian Power (Minus...