Measurement of gradient refractive index profile of crystalline lens of fisheye in vivo using optical coherence tomography
| Autor: | Yogesh Verma, K. D. Rao, M.K. Suresh, Pradeep Kumar Gupta, H. S. Patel |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
genetic structures Physics and Astronomy (miscellaneous) medicine.diagnostic_test business.industry Physics::Medical Physics General Engineering Physics::Optics General Physics and Astronomy Refractive index profile eye diseases Normalized frequency (fiber optics) Optics Optical path Optical coherence tomography medicine Focal length Gradient-index optics sense organs business Refractive index Optical path length |
| Zdroj: | Applied Physics B. 87:607-610 |
| ISSN: | 1432-0649 0946-2171 |
| Popis: | We report the use of optical coherence tomography (OCT) for noninvasive measurement of the refractive index profile of a crystalline lens of a fisheye. The approach exploits the fact that OCT provides a direct measurement of the optical path of the light traveled through the medium. The gradient refractive index profile for the crystalline lens was retrieved by iterative fitting of the optical path calculated by the ray tracing method with that experimentally measured using OCT. The estimated error in refractive index is approximately 1%. The measured gradient refractive index and Matthiessen’s ratio (ratio of focal length to lens radius) are in good agreement with the previously reported values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|