Reflective meniscometry: a non-invasive method to measure ... - NCBI
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Reflective meniscometry: a non-invasive method to measure ... - NCBI
Norihiko Yokoi, Anthony Bron, John TiVany, Nicholas Brown, James Hsuan, Colin Fowler. Abstract ..... 4 Scherz W, Doane MG, Dohlman CH. Tear volume in.
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Br J Ophthalmol 1999;83:92–97
Reflective meniscometry: a non-invasive method to measure tear meniscus curvature Norihiko Yokoi, Anthony Bron, John TiVany, Nicholas Brown, James Hsuan, Colin Fowler
Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kyoto, Japan N Yokoi NuYeld Laboratory of Ophthalmology, University of Oxford, Oxford A Bron J TiVany N Brown J Hsuan Department of Physiological Optics, University of Aston, Birmingham C Fowler Correspondence to: Anthony J Bron, NuYeld Laboratory of Ophthalmology, University of Oxford, Walton Street, Oxford OX2 6AW. Accepted for publication 29 July 1998
Abstract Aims—To devise a method to measure tear meniscus curvature by a non-invasive specular technique. Methods—A photographic system was devised. The system consisted of a camera and an illuminated target with a series of black and white stripes oriented parallel to the axis of the lower tear meniscus. The target was mounted on a flash gun close to the objective of a Brown macrocamera and calibrated using a graduated series of glass capillaries of known diameter, ground down to expose the inner wall. It was then applied to normal human eyes (n=45) to measure the tear meniscus curvature. A video system was also assessed which provided qualitative online information about the tear meniscus. Results—Using the photographic system, measured values for capillary radii were in excellent agreement with theoretical calculations (r2=0.996, p
