title: Tri-meridional analysis using arbitrary meridians.
abstract: The evaluation of the sphero-cylindrical components of curvature or refraction from measurements taken along three distinct meridians has been solved for various sets of three fixed meridians. A constraint of those solutions has been that the meridians of measurement are necessarily predetermined, which introduces an unwelcome restriction in experimental or clinical applications of tri-meridional analysis. A new solution is presented (in three formats: analogue computer, graphical and algebraic), which enables any set of three meridians to be used for tri-meridional analysis. A computer program listing (in BASIC) is included.
authors.affiliation: Dollond and Aitchison, Barnsley, South Yorkshire, UK.
authors.forename: H
authors.initials: H
authors.lastname: Burek
mesh_terms: D003202:Computers, Analog; D008433:Mathematics; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012984:Software