A volumetric depth image is captured. The volumetric depth image includes a front surface of a prescription lens, a back surface of the prescription lens, and a cornea of an eye of a wearer of the prescription lens. Lens-to-eye data is determined from the volumetric depth image. The lens-to-eye data includes measurements of the prescription lens with respect to the eye. A three-dimensional (3D) optical-mechanical fit profile is generated or the wearer based on the lens-to-eye data.