1. A method of selecting an ophthalmic lens implant at a corneal plane and at an implant plane, comprising the steps of: a) determining the spherical and cylindrical powers of an optical system of a human eye; b) equating two equivalent optical systems when the implant is at the corneal plane and when the implant is at the implant plane; c) calculating a spherical power of the ophthalmic lens implant at the corneal plane and at the implant plane based upon the results of steps (a) and (b); d) calculating a toric power of the implant at the corneal plane and at the implant plane by using a dioptric difference of spherical powers between steep and flat meridians; and e) selecting the ophthalmic lens implant based on the calculated spherical power and the calculated toric power.