Measurement of changes of the central corneal curvature due to intraocular pressure differences using holographic interferometry

Henryk T. Kasprzak; Werner Foerster M.D.; Gert von Bally

doi:10.1117/12.155721

3 September 1993 Measurement of changes of the central corneal curvature due to intraocular pressure differences using holographic interferometry

Henryk T. Kasprzak, Werner Foerster M.D., Gert von Bally

Author Affiliations +

Proceedings Volume 1889, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine III; (1993) https://doi.org/10.1117/12.155721
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Double exposure as well as real time holographic interferometry were used to evaluate changes of the central curvature of the bovine cornea in vitro under small intraocular pressure (IOP) differences. Double exposure holographic interferograms of expanding corneas were used to get the positions of dark interference fringes on the surface of the cornea. Real time holographic interferometry allows one to determine the absolute value of the displacement of the corneal center along the axis of the eye or the number of the fringe, which is located closest to the corneal center. A mathematical model is given for the radial distentions and displacement of the center of curvature in two mutually perpendicular planes of a longitudinal- section of the cornea along the axis of the eye. Examples of holographic interferograms of a bovine cornea recorded at an intraocular pressure of 1340 Pa and pressure differences of 10 Pa and 20 Pa, respectively, as well as resulting changes of the corneal curvature are presented.

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Henryk T. Kasprzak, Werner Foerster M.D., and Gert von Bally "Measurement of changes of the central corneal curvature due to intraocular pressure differences using holographic interferometry", Proc. SPIE 1889, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine III, (3 September 1993); https://doi.org/10.1117/12.155721

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KEYWORDS

Cornea

Holography

Eye

Holographic interferometry

Fringe analysis

Holograms

Beam splitters

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