I need to make two models of reading glass lens. One is 1.75 diopter the other 2.5. Client wants to use aspherical lens surface curvature due to limitataions of thickness.
He has provided the formula but I can't seem to get it to work. I don't work often enough in the surface world and I know this is a factor in not seeing my errors.
Even if you can help without the formula and create 1.75 ashperical, then that would be great and using that example I can do the rest of the work.
Many thanks in adance