Optometry & Vision Science

Skip Navigation LinksHome > January 2010 - Volume 87 - Issue 1 > A Method of Determining the Refractive Index of a Prismatic...
Optometry & Vision Science:
doi: 10.1097/OPX.0b013e3181c3837a
Technical Report

A Method of Determining the Refractive Index of a Prismatic Lens

Buckley, John G.*

Supplemental Author Material
Collapse Box

Abstract

Purpose. A new method of measuring lens refractive index requiring immersion in solution and measuring lens power in air and in solution is extended. Prompted by a clinical need, the new method using lens power can be extended by applying it to prismatic power as well. This article provides a theoretical basis explaining why this can be done.

Methods. The prismatic power of a prism is derived from first principles. Snell's Law and geometrical optics provide the framework for demonstrating the validity of the resulting formula.

Results. The sameness in formula derived using lens power or prism is shown, both from a paraxial and non-paraxial optics perspective. The effect of varying lens material and amount of prism is considered.

Conclusions. The prismatic method described provides a useful alternative method of determining the refractive index of any lens. In some cases, it may be the only method available. Practitioners should consider when each method will provide optimal results.

© 2010 American Academy of Optometry

Login

Article Tools

Share

Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.