This is a simple application designed for Optometrists, Opticians, and other eye care professionals.
With this tool, you can
1) Determine Contact Lens Power by specifying Spectacle Rx and vertex distance
2) Convert Corneal Curvature from Diopters (D) to Base Curve (mm) and vice versa
3) Estimate ophthalmic lens thickness [ center and edge]
4) Aniseikonia/Spectacle Magnification: will give you an estimate of the meridional magnification differences between the right and left eyes.