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Proceedings Paper

Application of diffractive optics for axial eye-length measurement using partial coherence interferometry
Author(s): Bo A. Moeller; G. Rudolph; A. Klopffleisch; Karl-Heinz Donnerhacke; Andreas N. Dorsel
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Paper Abstract

In the past, new techniques to measure axial eye length using partial coherent light or wavelength-tuned light have ben developed. They are based on the interference of the light reflected at the cornea and the retina of the eye. This method has then advantage of measuring independently of axial eye movements. However, the light is reflected from the retina and the cornea with different divergencies. These divergencies have to be matched to collect as much light as possible in order to achieve a sufficient interference signal. We have employed a diffractive optical element which focuses one part of the light onto the cornea while the other part of the light remains uninfluenced and is focused onto the retina by the optical system of the eye. As shown by measurements on model and on living eyes the signal-to- noise-ratio and the sensitivity of the dual beam partial coherence interferometry was improved.

Paper Details

Date Published: 5 December 1996
PDF: 8 pages
Proc. SPIE 2930, Lasers in Ophthalmology IV, (5 December 1996); doi: 10.1117/12.260878
Show Author Affiliations
Bo A. Moeller, Carl Zeiss Jena GmbH (Sweden)
G. Rudolph, Carl Zeiss Jena GmbH (Germany)
A. Klopffleisch, Carl Zeiss Jena GmbH (Germany)
Karl-Heinz Donnerhacke, Carl Zeiss Jena GmbH (Germany)
Andreas N. Dorsel, Carl Zeiss Jena GmbH (Germany)

Published in SPIE Proceedings Vol. 2930:
Lasers in Ophthalmology IV
Reginald Birngruber; Adolf Friedrich Fercher; Philippe Sourdille, Editor(s)

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