Refractive indices with Haag-Streit Lenstar biometer

Atchison, David A., Suheimat, Marwan, & Verkicharla, Pavan K. (2014) Refractive indices with Haag-Streit Lenstar biometer. In Proceedings VII European/I World Meeting in Visual and Physiological Optics, Wroclaw University of Technology, Wroclaw, Poland, pp. 325-328.

Abstract

Purpose: To estimate refractive indices used with the Lenstar biometer. Methods: Axial lengths of model eyes were determined using an IOLMaster biometer and a Lenstar; comparing these lengths gave an overall eye index for the Lenstar. Using the Lenstar Graphical User interface, we determined that boundaries between media could be manipulated so that there were opposite changes in optical pathlength on either side of the boundary and specified changes in distances determined the ratios of media indices. These ratios were combined with the overall eye index to estimate indices. Results: The IOLMaster and Lenstar produced axial length estimates to within ±0.01 mm. Estimations of group refractive indices were 1.340, 1.341, 1.415 and 1.354 for cornea, aqueous, lens and overall eye, respectively. The aqueous and lens indices, but not those for the cornea, are similar to schematic eye indices and reasonable lens indices. Conclusion: The Lenstar appears to use different refractive indices for different ocular media.

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ID Code: 79435
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: axial length; refractive index; Lenstar; partial coherence interferometry
ISBN: 9788374938471
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2014 [please consult the authors]
Deposited On: 15 Dec 2014 06:02
Last Modified: 19 Dec 2014 12:35

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