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Technical notes on prism-dioptre and Prentice's rule
1Department of Ophthalmology, School of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
Purpose:
To show an alternative interpretation for prism-dioptre and access Prentice's rule accuracy.
Methods:
Algebraic calculation.
Results:
The 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.
Conclusions:
The 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.
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