OCT-based eye axis measurement method and device

Abstract

The invention discloses an OCT-based eye axis measurement method and device. The method comprises the following steps: performing self-inspection on an optical path of eye axis measurement by utilizing a reference position calibration method, so that a posterior segment optical path adjusting device is located at a reference position; and adjusting the eye axis measurement device to collect the OCT two-dimensional tomography results of the cornea and the retina to be measured at the same time, and then measuring the eye axis length of the eye to be measured according to the OCT two-dimensional tomography results of the cornea and the retina to be measured and the displacement of the posterior segment optical path adjusting device. The eye axis measurement device is used for implementing the eye axis measurement method, and OCT two-dimensional tomography is performed on the anterior segment and the posterior segment of the eye to be measured at the same time. According to the invention, the anterior segment and the posterior segment can be synchronously focused, synchronous and clear imaging of the anterior segment and the posterior segment can be further realized, and the reference position of the optical path of the sample arm can be quickly calibrated before each eye axis measurement by using a reference position calibration method, so that the accuracy of eye axis measurement can be improved.

Description

technical field [0001] The present invention relates to an eye axis measurement method and device belonging to the technical field of medical equipment, in particular to an eye axis measurement method and device based on OCT (Optical Coherence Tomography, optical coherence tomography technology). [0002] technical background [0003] Regular eye examinations are helpful for early diagnosis and treatment of eye diseases. In various ophthalmic examinations, the axial length of the eye can be used to determine the source of the refractive error of the human eye and to measure the parameters of the intraocular lens after cataract surgery. It is an important indicator of ophthalmic examinations. Currently available eye axis measurement methods on the market can be divided into optical coherence biometrics (such as ZEISS IOL-Master, non-contact measurement) and ultrasonic measurement (ie A-ultrasound, contact measurement). However, the existing technology has the following disadv...

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Problems solved by technology

However, the existing technology has the following disadvantages: A-ultrasound needs to contact the eyeball, and there are errors caused by sound wave reflection when measuring eye diseases such as cataracts; equipment such as IOL-Master is expensive, and it is difficult to widely use it in domestic hospitals

At present, there are some eye axis measurement methods and devices based on OCT technology. These methods can realize eye axis measurement, but there are still the following disadvantages: In the eye axis measurement systems and methods disclosed in patent documents 202011264580.7, 202010202763. The time-sharing imaging of the eye segment and the posterior segment can measure the axial length of the eye, and the time-sharing imaging may cause the eye axis measurement result to be affected by eye movement; in the eye axis measurement system and method disclosed in patent document 202011037937. Segments can be imaged synchronously, but only the anterior segment is focused, and the posterior segment has only blurred imaging results. The exact imaging position of the posterior segment cannot be determined, which may affect the accuracy of eye axis measurement; disclosed in patent document 201910756738.3 In the ocular axis measurement system and method, the anterior segment and the posterior segment can be imaged synchronously, but the anterior segment light beam is not parallel light at the scanning galvanometer, which may cause a large image plane curvature during imaging, and the diopter in front of the eyepiece is connected to the optical path Limited by the position of the anterior segment optical path, it cannot be adjusted according to the movement of the human eye with different diopters in the actual measurement, which will affect the actual measurement

In particular, the above-mentioned OCT-based eye axis measurement methods have a common deficiency, that is, the calculation formula of the eye axis length includes the inherent optical path of the anterior segment and the posterior segment of the eye in the sample arm. The displacement of the mechanical parts will introduce calculation errors in the measurement of the axial length of the eye

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