Power Optics: Nominal Versus 3D Position of Wear

Calculating position of wear explores beyond the exam chair. A patient’s nominal prescription sometimes must be converted into real world optics in 3D space. Explore nominal, effective, and compensated lens dioptric power based on position of wear in 3D space, implications of refractive index and substrate on dioptric vs. surface power, spherical and cylindrical contact lens vs. spectacle power based on vertex.