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Proceedings Paper

Interferometry and ophthalmics at the College of Optical Sciences
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Paper Abstract

A long-term research program has been in place at the College of Optical Sciences to apply interferometry to ophthalmic applications. These unique systems have been developed in response to industrial need. The first system is a transmission Mach-Zehnder interferometer used to measure the transmitted wavefront of a contact lens while it is submersed in saline. This interferometer allows the refractive power distribution of the lens to be measured. A second system makes use of a low-coherence interferometer to measure the index of refraction of contact lens materials. This task is complicated by the fact that the material is only available in very thin, flexible samples, and because the sample must remain hydrated in saline during the measurement. A third system also makes use of low-coherence interferometry to characterize the surface profile of both surfaces of a contact lens. Combined with index information, a complete model of the contact lens can be produced. Two additional interferometers examine the dynamics of fluid layers on the surface of a contact lens (in vitro) and of the tear film on the surface of the cornea (in vivo). Both systems are instantaneous phase shifting Twyman-Green interferometers. The evolution and changes to the fluid surface is measured at video rates with sub-wavelength precision. This paper tells the story of this research program.

Paper Details

Date Published: 5 September 2014
PDF: 27 pages
Proc. SPIE 9186, Fifty Years of Optical Sciences at The University of Arizona, 91860W (5 September 2014); doi: 10.1117/12.2064333
Show Author Affiliations
John E. Greivenkamp, College of Optical Sciences, The Univ. of Arizona (United States)
Gregory A. Williby, Johnson & Johnson Vision Care, Inc. (United States)
Eric P. Goodwin, Nikon Research Corp. of America (United States)
Brian C. Primeau, MIT Lincoln Lab. (United States)
Kyle C. Heideman, College of Optical Sciences, The Univ. of Arizona (United States)
Jason D. Micali, College of Optical Sciences, The Univ. of Arizona (United States)
Russell T. Spaulding, Johnson & Johnson Vision Care, Inc. (United States)


Published in SPIE Proceedings Vol. 9186:
Fifty Years of Optical Sciences at The University of Arizona
Harrison H. Barrett; John E. Greivenkamp; Eustace L. Dereniak, Editor(s)

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