Knife-edge system for evaluating contact lenses

Arthur Ho; Klaus Ehrmann

doi:10.1117/12.387512

7 June 2000 Knife-edge system for evaluating contact lenses

Arthur Ho, Klaus Ehrmann

Proceedings Volume 3908, Ophthalmic Technologies X; (2000) https://doi.org/10.1117/12.387512
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

Abstract

With the increasing complexity of contact lens designs and the demand on visual performance required by wearers, the ability to assess the design and optical quality of a contact lens is an important capability. While more complex systems such as Hartmann-Shack devices exist, practitioners often call for a simple, quick and inexpensive system that can provide the above functions. A simple optical system based on modifying the knife-edge test has been developed for assessing design and optical quality. Incorporation of a Badal-type lens layout added lens power measurement capability. This system provides the practitioner with the ability to undertake rapid visual assessment of a contact lens's quality.

Citation Download Citation

Arthur Ho and Klaus Ehrmann "Knife-edge system for evaluating contact lenses", Proc. SPIE 3908, Ophthalmic Technologies X, (7 June 2000); https://doi.org/10.1117/12.387512

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