Technical notes on prism‐dioptre and Prentice's rule

Abstract

AbstractPurposeTo show an alternative interpretation for prism‐dioptre and access Prentice's rule accuracy.MethodsAlgebraic calculation.ResultsThe prism‐dioptre can be expressed as a percentage of the distance between the prism and the plane of prismatic dislocation. Prentice's rule is an imprecise mathematical expression prone to expressive errors.ConclusionsThe prism‐dioptre seems to be more informative when interpreted as a percentage. Prentice's rule is more effective as a pedagogical approach for introducing the concept of spherical lenses' prismatic image dislocation rather than a method for calculating its actual value.