An oct system and method for measuring the optical path value of the eye axis

Abstract

The invention discloses an OCT (Optical Coherence Tomography) system for measuring the optical path value of an axis oculi and a method. The system comprises an OCT system light source, an optical fiber coupler, a detection system, a control system, a sample arm component, a reference arm component, a cornea before-and-back position alignment component and an outer eye camera component, wherein the outer eye camera component is used for monitoring an iris of eyes under test, and an operator controls the sample arm component to adjust a corneal vertex to the main optical axis of the OCT system according to the iris; the control system is used for judging the distance from the corneal vertex to an eye objective lens, and the distance from the corneal vertex to the eye objective lens is adjusted to meet the requirement on work of the system by means of the before-and-back adjustment of the sample arm component controlled by the control system; an optical path adjusting component adjusts the optical path of the sample arm component, and thus fundi of different human eyes are matched with the optical path of a reflector of a reference arm of the system to realize the OCT imaging of the fundi; the optical path value LEye of the axis oculi of the human eye can be measured according to the formula: LEye=LRDK1toEc+S+hRetinal. According to the OCT system for measuring the optical path value of the axis oculi and the method, the corneal vertex is accurately positioned, and by combining with the fundus OCT imaging technology, the test result of the optical path value of the axis oculi of the human eye is more accurate.

Description

technical field [0001] The invention belongs to the field of optoelectronics, and in particular relates to an OCT system and method for measuring the optical path value of the eye axis by using corneal positioning. Background technique [0002] The axial length of the eye is an important indicator for judging the source of refractive error of the human eye, distinguishing true myopia from pseudomyopia, and measuring intraocular lens parameters after cataract surgery. The existing eye axial length measurement devices on the market include A-ultrasound measurement method and optical measurement method. The A-ultrasound measurement method adopts the principle of ultrasonic ranging, which requires the probe to directly contact the human eye, and the resolution of the ultrasonic is low, and the measurement is not accurate enough. The optical measurement method is based on the principle of dual-wavelength optical coherence, and the implementation is relatively complicated and the...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides an OCT system and method for measuring the optical distance value of the eye axis. The axial length of the human eye will not be accurate for this defect

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