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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 15, Iss. 1 — Jan. 1, 1998
  • pp: 268–275

Interferometric measurement of tear film thickness by use of spectral oscillations

Nick Fogt, P. Ewen King-Smith, and Grady Tuell  »View Author Affiliations

JOSA A, Vol. 15, Issue 1, pp. 268-275 (1998)

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A method of measuring the tear film thickness is described in which interference causes oscillations in the reflectance spectrum from the tears. Strong oscillations were usually observed when a contact lens was worn. Measurement of modulation and phase of these oscillations confirmed that they were associated with the tear layer in front of the contact lens. Calculated thickness of this layer averaged 2.7 µm. In one out of five subjects, weak oscillations were sometimes observed without a contact lens. These oscillations probably arose from the aqueous layer of the tears with a thickness of 3 µm. The relative merits of three interference methods of measuring the tear film are discussed.

© 1998 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5700) Instrumentation, measurement, and metrology : Reflection
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(260.0260) Physical optics : Physical optics
(300.0300) Spectroscopy : Spectroscopy
(310.0310) Thin films : Thin films

Original Manuscript: January 21, 1997
Revised Manuscript: August 5, 1997
Manuscript Accepted: August 6, 1997
Published: January 1, 1998

Nick Fogt, P. Ewen King-Smith, and Grady Tuell, "Interferometric measurement of tear film thickness by use of spectral oscillations," J. Opt. Soc. Am. A 15, 268-275 (1998)

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