I have always used the Sola Access lens lens for a computer lens. We are now using a lab where we can get the Office lens. I have read great things about this lens here but I need help fitting it.

I know the frame needs to have a B measurement of 30 and the fitting height needs to be 16. Are these written in stone or can they be fudged a little? For example what if the B is 28 or 29? What if the fitting height is 15? Do you measure to the mid pupil or lower pupil?

I have different add choices. How do I chose which is the correct one?

Thanks for your help.