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18 June 2018 Noncontact method for sensing thickness and refractive index of intraocular lens implants using a self-calibrating dual-confocal laser caliper
Do-Hyun Kim, Robert H. James, Don Calogero, Ilko K. Ilev
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Journal of Biomedical Optics, Vol. 23, Issue 6, 067004 (June 2018). https://doi.org/10.1117/1.JBO.23.6.067004
Abstract
We present a fiber-optic dual-confocal laser caliper method for noncontact high-precision sensing and measuring thickness and refractive index of intraocular lens (IOL) implants. The principle of the method is based on sensing and measuring the confocal intensity response of the laser beam reflection from the opposite object surfaces, which provides the advanced feature of having no limitations on the object shape, thickness, and transparency. Using single-mode optical fibers and a 658-nm laser source, the thickness measurement accuracy was assessed to be as high as 5  μm. In addition, refractive index of a transparent object with thickness smaller than the working distance of the focusing lenses can be measured. The thickness and refractive index of a planoconvex IOL were measured with a high accuracy.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Do-Hyun Kim, Robert H. James, Don Calogero, and Ilko K. Ilev "Noncontact method for sensing thickness and refractive index of intraocular lens implants using a self-calibrating dual-confocal laser caliper," Journal of Biomedical Optics 23(6), 067004 (18 June 2018). https://doi.org/10.1117/1.JBO.23.6.067004
Received: 21 February 2018; Accepted: 30 May 2018; Published: 18 June 2018
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Cited by 3 scholarly publications.
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KEYWORDS
Refractive index
Confocal microscopy
Objectives
Calibration
Microscopes
Reflection
Signal detection
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