title: A simple lens power calculation program for the HP-67 and HP-97 calculators.
mesh_terms: D003201:Computers; D005069:Evaluation Studies as Topic; D006801:Humans; D007910:Lenses, Intraocular; D008433:Mathematics; D008722:Methods; D055095:Optics and Photonics; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000517:prevention & control / Q000534:rehabilitation