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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 3, Iss. 10 — Oct. 1, 2012
  • pp: 2471–2488

In vivo human crystalline lens topography

Sergio Ortiz, Pablo Pérez-Merino, Enrique Gambra, Alberto de Castro, and Susana Marcos  »View Author Affiliations


Biomedical Optics Express, Vol. 3, Issue 10, pp. 2471-2488 (2012)
http://dx.doi.org/10.1364/BOE.3.002471


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Abstract

Custom high-resolution high-speed anterior segment spectral domain optical coherence tomography (OCT) was used to characterize three-dimensionally (3-D) the human crystalline lens in vivo. The system was provided with custom algorithms for denoising and segmentation of the images, as well as for fan (scanning) and optical (refraction) distortion correction, to provide fully quantitative images of the anterior and posterior crystalline lens surfaces. The method was tested on an artificial eye with known surfaces geometry and on a human lens in vitro, and demonstrated on three human lenses in vivo. Not correcting for distortion overestimated the anterior lens radius by 25% and the posterior lens radius by more than 65%. In vivo lens surfaces were fitted by biconicoids and Zernike polynomials after distortion correction. The anterior lens radii of curvature ranged from 10.27 to 14.14 mm, and the posterior lens radii of curvature ranged from 6.12 to 7.54 mm. Surface asphericities ranged from −0.04 to −1.96. The lens surfaces were well fitted by quadrics (with variation smaller than 2%, for 5-mm pupils), with low amounts of high order terms. Surface lens astigmatism was significant, with the anterior lens typically showing horizontal astigmatism ( Z 2 2 ranging from −11 to −1 µm) and the posterior lens showing vertical astigmatism ( Z 2 2 ranging from 6 to 10 µm).

© 2012 OSA

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(330.7327) Vision, color, and visual optics : Visual optics, ophthalmic instrumentation

ToC Category:
Ophthalmology Applications

History
Original Manuscript: June 7, 2012
Revised Manuscript: July 26, 2012
Manuscript Accepted: August 24, 2012
Published: September 12, 2012

Citation
Sergio Ortiz, Pablo Pérez-Merino, Enrique Gambra, Alberto de Castro, and Susana Marcos, "In vivo human crystalline lens topography," Biomed. Opt. Express 3, 2471-2488 (2012)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-3-10-2471


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