Interferometer for measuring the dynamic surface topography of a human tear film

Brian C. Primeau, John E. Greivenkamp

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

The anterior refracting surface of the eye is the thin tear film that forms on the surface of the cornea. Following a blink, the tear film quickly smoothes and starts to become irregular after 10 seconds. This irregularity can affect comfort and vision quality. An in vivo method of characterizing dynamic tear films has been designed based upon a near-infrared phase-shifting interferometer. This interferometer continuously measures light reflected from the tear film, allowing sub-micron analysis of the dynamic surface topography. Movies showing the tear film behavior can be generated along with quantitative metrics describing changes in the tear film surface. This tear film measurement allows analysis beyond capabilities of typical fluorescein visual inspection or corneal topography and provides better sensitivity and resolution than shearing interferometry methods. The interferometer design is capable of identifying features in the tear film much less than a micron in height with a spatial resolution of about ten microns over a 6 mm diameter. This paper presents the design of the tear film interferometer along with the considerations that must be taken when designing an interferometer for on-eye diagnostics. Discussions include eye movement, design of null optics for a range of ocular geometries, and laser emission limits for on-eye interferometry.

Original languageEnglish (US)
Title of host publicationDesign and Quality for Biomedical Technologies V
DOIs
StatePublished - Jun 11 2012
EventDesign and Quality for Biomedical Technologies V - San Francisco, CA, United States
Duration: Jan 22 2012Jan 23 2012

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume8215
ISSN (Print)1605-7422

Other

OtherDesign and Quality for Biomedical Technologies V
Country/TerritoryUnited States
CitySan Francisco, CA
Period1/22/121/23/12

Keywords

  • Tear film
  • contact lens
  • corneal topography
  • fluid layer
  • interferometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Fingerprint

Dive into the research topics of 'Interferometer for measuring the dynamic surface topography of a human tear film'. Together they form a unique fingerprint.

Cite this