Noncontact method for sensing thickness and refractive index of intraocular lens implants using a self-calibrating dual-confocal laser caliper
| Autor: | Ilko K. Ilev, Don Calogero, Robert H. James, Do-Hyun Kim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Accuracy and precision
Optical fiber Materials science Microscope genetic structures medicine.medical_treatment Confocal Biomedical Engineering Intraocular lens Biosensing Techniques 01 natural sciences law.invention 010309 optics Biomaterials 03 medical and health sciences 0302 clinical medicine Optics Lens Implantation Intraocular law 0103 physical sciences medicine Lenses Intraocular Microscopy Confocal business.industry Optical Imaging Laser eye diseases Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Refractometry Calibration 030221 ophthalmology & optometry Calipers sense organs business Refractive index |
| Zdroj: | Journal of biomedical optics. 23(6) |
| ISSN: | 1560-2281 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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