SD-OCT based device and method for measuring curvature of eye cornea

Abstract

The invention relates to a SD-OCT based device and method for measuring the curvature of an eye cornea. The device comprises an optical path module, an image collection module, and an image processingmodule. A frequency domain optical coherence tomography imaging technology is adopted to carry out high resolution two dimensional imaging on an eye cornea; the thickness of the eye cornea can be accurately measured by a liquid lens; a dual reference arm device can match the optical path difference between a reference arm and a sample arm without moving a reflector back and forth when the focal length of the liquid lens changes; the cornea imaging length can be controlled by using a one dimensional scanning galvanometer; and the collected image information is processed by an algorithm programmed by matlab to automatically calculate the curvature of the eye cornea. The provided method can measure the curvature of a human in-vivo eye cornea in any position, and the measurement is noncontact, nondestructive, and highly precise.

Description

technical field [0001] The invention relates to the application field of optical coherence tomography technology, in particular to a device and method for measuring eye corneal curvature. Background technique [0002] The closest existing technical solution to the technical solution designed in the invention is the corneal curvature measurement method adopted in the patent "A Device and Method for Digitized Corneal Curvature Measurement" (CN108498067A). In this method, after obtaining the clearest image of the center of the human eye cornea of ​​the user to be detected, the optical fiber coupler is used to launch the measurement optical path and the reference optical path. the distance between. The curvature of the human eye cornea of ​​the user to be detected is calculated according to the distance between the center of the human eye cornea and the measurement reference object. In the above-mentioned patents, the measurement of the curvature of the human cornea is based o...

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Problems solved by technology

In the above-mentioned patents, the measurement of the curvature of the human cornea is based on the traditional keratometer. This method requires that the light must pass through the center of the human cornea, so the positioning accuracy of the center of the human cornea is very high, and the composition of the center of the human eye is very high. There is no quantitative standard for the clearest image, which makes different operators have certain deviations in the clarity of the imaging, resulting in errors in the final corneal curvature measurement results; the above-mentioned patent measures the curvature of the anterior surface of the human cornea , cannot measure the curvature of the posterior surface of the human cornea

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