News & Events
Interferometry and Ophthalmic Optics
Release time:July 8, 2019

Topic: Interferometry and Ophthalmic Optics

Speaker: Prof. John E. Greivenkamp, SPIE/OSA Fellow, 2019 SPIE President-Elect, College of Optical Sciences, University of Arizona

Time: 2:30 - 4:30 PM, July 11

Venue: B707, New Main Building


A long-term research program has been in place at the College of Optical Sciences to apply interferometry to ophthalmic applications. The first developed system is a transmission Mach-Zehnder interferometer that measures the transmitted wavefront of a contact lens while it is submersed in saline in order to determine the refractive power distribution of the lens. A second system makes use of a low-coherence interferometer to measure the index of refraction of contact lens materials. This system measures very thin samples that 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 of these 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.

Biography of the Speaker:

John E. Greivenkamp is a Professor at the James C. Wyant College of Optical Sciences of the University of Arizona where he has taught courses in optical engineering since 1991. After receiving a Ph.D. from the Optical Sciences Center in 1980, he was employed by Eastman Kodak. He is a fellow of SPIE — the International Society for Optics and Photonics and of OSA. He serves as the editor for the SPIE Field Guides Series and is the author of Field Guide to Geometrical Optics. He is the founder and curator of the Museum of Optics at the College of Optical Sciences. Professor Greivenkamp was honored with the 2017 SPIE Educator Award and he serves as the 2019 SPIE President-Elect.

School of Instrumentation Science and Opto-electronics Engineering