Application of diffractive optics for axial eye-length measurement using partial coherence interferometry

Bo A. Moeller; G. Rudolph; A. Klopffleisch; Karl-Heinz Donnerhacke; Andreas N. Dorsel

doi:10.1117/12.260878

5 December 1996 Application of diffractive optics for axial eye-length measurement using partial coherence interferometry

Bo A. Moeller, G. Rudolph, A. Klopffleisch, Karl-Heinz Donnerhacke, Andreas N. Dorsel

Author Affiliations +

Proceedings Volume 2930, Lasers in Ophthalmology IV; (1996) https://doi.org/10.1117/12.260878
Event: BiOS Europe '96, 1996, Vienna, Austria

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.

Citation Download Citation

Bo A. Moeller, G. Rudolph, A. Klopffleisch, Karl-Heinz Donnerhacke, and Andreas N. Dorsel "Application of diffractive optics for axial eye-length measurement using partial coherence interferometry", Proc. SPIE 2930, Lasers in Ophthalmology IV, (5 December 1996); https://doi.org/10.1117/12.260878

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