title: Some notes on the construction of "zonal aspheric" aphakic spectacle lenses.
abstract: Smith and Atchison (1983) give an optical model of a "zonal aspheric" aphakic lens, but note that lenses mass-produced to this design philosophy do not show similar optical properties to the model. This paper offers an explanation for this discrepancy, supported by lens measurements.
mesh_terms: D001035:Aphakia / Q000534:rehabilitation*; D003261:Contact Lenses; D006801:Humans; D008962:Models, Theoretical; D055095:Optics and Photonics