This is super helpful! Would you be able to go through a few more examples on this? With more in-depth on the whys of each step? Currently studying for my NCLE and I am very visual and have been enjoying all the information you provide!
I know this video is old, but could you clarify the effective power of (-)7.50. Shouldn't lenses that move closer to the eye become less plus, more minus? I don't think you assign a +/- to the vertex distance cause it's just "millimeters moved." Then you'd have: -7.50/ 1 + (.013 x -7.50). This comes out to -8.31D of effective power instead of -6.85. Or am I wrong? Thanks. Your videos are awesome
Sorry for all the questions but for the FAP option Is it just a -6.37 vs -6.35 because they only go up or down in .125 D steps so a -6.35 doesn’t exist?
In another video you said that you couldn't use the spherical rgp for against the rule astigmatism, but this video you said you can correct up to 2 Diopters in against the rule. Can you clarify for me.
Hey Leslie. A SPHERICAL RGP will correct for up to 3D of WTR astigmatism or 2D ATR astigmatism. The reason for this is because when we blink, the lens will follow the path of the steepest axis. The with the rule astigmatism lens will go up and down, which is more natural so the eye can tolerate more astigmatism correction. The against the rule lens will want to go horizontally on the eye upon blinking, which is much less natural. Hope this helps!
Thank you so much, I have just passed my NCLE test because of you and your awesome videos, It is very helpful, and a good source of information.
CONGRATS Niven! So glad to hear 😊
This is super helpful! Would you be able to go through a few more examples on this? With more in-depth on the whys of each step? Currently studying for my NCLE and I am very visual and have been enjoying all the information you provide!
Hi, Nikki! Thank you for subscribing and watching. I can definitely do that in an upcoming video 👍🏼 (I’m a visual learner, too!)
I know this video is old, but could you clarify the effective power of (-)7.50. Shouldn't lenses that move closer to the eye become less plus, more minus? I don't think you assign a +/- to the vertex distance cause it's just "millimeters moved." Then you'd have: -7.50/ 1 + (.013 x -7.50). This comes out to -8.31D of effective power instead of -6.85. Or am I wrong? Thanks. Your videos are awesome
You just said a steeper lens is going to fit tighter and a larger diameter lens is going to fit tighter. Is that accurate? Around the 12:36 mark
Yes. That is accurate.
The larger the diameter, the steeper the fit and the tighter the fit, always.
Thank you for the videos, your explanations are so clear and helpful, they just make sense!
Thank you for the thoughtful comment. I appreciate you watching!
Why did you use 1 + in the compensation formular instead of 1-
The info at the end wrapped it up well!🙌🏼
Thank you so much for these videos!
Thanks for watching. I hope they are beneficial for you in your studies!
Quick question just to clarify, going from 13mm vertex to 0 you would minus .013? Then vice versa if 0 out to 13mm?
That is correct. It is a negative number for most traditional contact lens VD problems where you are going from glasses to contact lenses. Good luck!
Thanks Sam , I’m sitting for the fla State board soon
That’s so cool! You are missed!
Sorry for all the questions but for the FAP option Is it just a -6.37 vs -6.35 because they only go up or down in .125 D steps so a -6.35 doesn’t exist?
Hi,
Exactly. Just rounding to the nearest 8th diopter step 😊
In another video you said that you couldn't use the spherical rgp for against the rule astigmatism, but this video you said you can correct up to 2 Diopters in against the rule. Can you clarify for me.
Hey Leslie.
A SPHERICAL RGP will correct for up to 3D of WTR astigmatism or 2D ATR astigmatism.
The reason for this is because when we blink, the lens will follow the path of the steepest axis. The with the rule astigmatism lens will go up and down, which is more natural so the eye can tolerate more astigmatism correction. The against the rule lens will want to go horizontally on the eye upon blinking, which is much less natural. Hope this helps!
Step-a-long method is much easier to get vertex compensation. Good presentation though.
Great
Thanks, Vida! Make sure to subscribe 😊