Attached is a diagram and a picture of my current model and a GIF image what I'm trying to achieve.
The inner circle is a perfect sphere with a radius of 6.63
The outer circle the bottom half is from a perfect sphere with a radius of 12. The top half had a radius of 12 as well but was reduced 90% in the Z direction. This is to simulate how an eye is not perfectly spherical.
Gif Image Showing My Goal:
The image above shows me taking the inner sphere and raising it out of the other sphere. This will create the 'cornea' of the eye I plan on modeling later. I can then use the modifier boolean to union them together at a later time.
I'm doing this for 3D Printing and medical purposes so the dimensions need to be exact. How do I raise the inner sphere so that it will intersect the other sphere and create a 12 distance once it's outside. In the GIF image I uploaded you can see I was off in my attempt to raise it and I only guessed with a measuring tool what created the 12 distance.
Put another way the points where the circumference of the inner circle touch the circumference of the outer circle should create a distance of 12. In my diagram it's the dashed line that says 12.
What is the best way to go about this so it's pixel perfect? (as much as possible)