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Cornea measuring method and system

A corneal measurement and corneal technology, used in eye testing equipment, medical science, diagnosis, etc., can solve problems such as the inability to measure the corneal refractive index and the inability to obtain corneal thickness, and achieve high-precision results

Active Publication Date: 2018-10-12
东北大学秦皇岛分校
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to know the central thickness of the measured concave lens during the measurement process, that is to say, when this technology is applied to corneal measurement, it also needs to know the thickness of the cornea, and according to the previous statement, the corneal thickness cannot be obtained , so this technique cannot be used for corneal refractive index measurements

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  • Cornea measuring method and system
  • Cornea measuring method and system

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Embodiment 1

[0035] Embodiment 1 of the present invention: a kind of corneal measuring method, such as Figure 9 As shown, first, optical coherence tomography is used to measure the optical path L0 from the front surface of the cornea to the back surface; secondly, the focus lens is moved, when the focus of the probe light is on the front and back surfaces of the cornea, the signal intensity is the maximum value, and the current When the focal point of the probe light is located on the front and rear surfaces of the cornea, the distance L1 between the two corresponding positions of the focusing lens; finally, the refractive index and corneal thickness of the cornea are obtained using ray tracing technology.

[0036] Obtaining the refractive index and corneal thickness of the cornea by using the ray tracing technique may specifically include the following steps:

[0037] a. According to the optical path of the detection arm, use ray tracing technology (existing technology) to establish the ...

Embodiment 2

[0048] Embodiment 2: realize a kind of corneal measurement system of the method described in embodiment 1, such as figure 1 As shown, it includes: a low-coherence light interference and signal processing device A, a reference arm B and a detection arm C, and the low-coherence light interference and signal processing device A includes: a low-coherence light source 1, a first optical fiber 2, and a beam splitter 3 , second optical fiber 4, first optical fiber collimator 5, third optical fiber 6, second optical fiber collimator 7, fourth optical fiber 8, fourth lens 9, grating 10, third lens 11, linear array CCD 12, Cables 13 and computer 14; the reference arm B includes: a first lens 15 and a reflector 16, the low-coherent light source 1 is connected to the beam splitter 3 through the first optical fiber 2, and the beam splitter 3 is connected to the second optical fiber 4 Connected with the first fiber collimator 5, the optical splitter 3 is connected with the second optical fi...

Embodiment 3

[0050] Embodiment 3: realize a kind of corneal measurement system of the method described in embodiment 1, such as Figure 10 As shown, it includes: a low-coherent light interference and signal processing device A, a reference arm B and a detection arm C. The low-coherent light interference and signal processing device A includes: a low-coherent light source 1, a beam splitter 3, a first optical fiber standard Collimator 5, the second fiber collimator 7, the fourth lens 9, grating 10, the third lens 11, linear array CCD 12, cables 13 and computer 14; the reference arm B includes: the first lens 15 and Mirror 16, the low-coherent light source 1 is connected to the beam splitter 3, the beam splitter 3 is connected to the first fiber collimator 5, the beam splitter 3 is connected to the second fiber collimator 7, and the beam splitter 3 makes the detection light and The reference light passes through the fourth lens 9, the grating 10, and the third lens 11 successively, and is im...

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Abstract

The invention discloses a cornea measuring method and a cornea measuring system. The cornea measuring method comprises the following steps: carrying out measurement by adopting an optical coherence tomography method, thus obtaining the optical path L0 from the front surface to the rear surface of the cornea; moving a focusing lens, wherein when the focal point of detection light is located on thefront and rear surfaces of the cornea, the signal intensity is the maximal value, and acquiring the distance L1 between the two corresponding positions where the focusing lens is located when the focal point of detection light is located on the front and rear surfaces of the cornea; acquiring the refractive index of the cornea and the thickness of the cornea by utilizing the ray tracing technology. With the method and the system, the non-contact in-vivo accurate measurement for the refractive index of the cornea and the thickness of the cornea is realized and can serve as the reference for therefractive surgery of the human eyes, a reliable basis is provided for calculating the eye parameters, and thus the ideal refraction effect is achieved for the human eyes after the surgery.

Description

technical field [0001] The invention relates to a cornea measurement method and system, belonging to the technical field of optical interference measurement. Background technique [0002] The cornea is an important part of the refractive system of the human eye, and its refractive power accounts for about 74% of the total refractive power of the human eye. Before performing refractive surgery on the human eye, such as corneal refractive surgery or intraocular lens implantation, only by accurately and effectively measuring the corneal diopter can it be possible to obtain a more ideal refractive effect after the operation. Corneal curvature, refractive index and thickness are the main parameters that characterize the corneal refractive power (diopter). The cornea is located at the forefront of the human eye. With the help of a keratometer or an anterior segment measurement instrument based on Fourier-domain Optical Coherence Tomography (FD-OCT), the anterior and posterior sur...

Claims

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Application Information

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IPC IPC(8): A61B3/107A61B3/10
CPCA61B3/102A61B3/107
Inventor 赵玉倩王毅马振鹤
Owner 东北大学秦皇岛分校
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