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Method for correcting corneal curvature instrument system astigmatism

A keratometer and cornea technology, applied in the field of astigmatism correction of the keratometer system, can solve problems such as actual measurement error, impact of ophthalmological diagnosis and treatment, inaccurate optometry, etc.

Inactive Publication Date: 2015-09-23
ZHONGBEI UNIV
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Problems solved by technology

This method is simple and reliable, but due to the difference in the precision of the processing and installation of the annular diaphragm and the meridional sagittal aberration of the optical lens itself, even when measuring the standard eye without astigmatism, the CCD The circular image presented will also have a certain ellipsoidal nature, which is the systematic astigmatism of the keratometer. If it is not corrected, it will inevitably bring errors to the actual measurement, resulting in inaccurate optometry, which will affect further ophthalmic diagnosis and treatment. treatment has an impact

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  • Method for correcting corneal curvature instrument system astigmatism
  • Method for correcting corneal curvature instrument system astigmatism
  • Method for correcting corneal curvature instrument system astigmatism

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Embodiment Construction

[0038] The technical solution of the present invention will be further described below.

[0039] The method for correcting the astigmatism of the keratometer system is to correct the system astigmatism of the keratometer, and the keratometer includes annular lighting sources 2a, 2b, an imaging lens group 8, a CCD camera module 7, a processor 9, image processing software and a display screen 10, wherein, the imaging lens group includes a convex lens 3, a field stop 4, a crescent lens 5, and a doublet lens 6; the ring-shaped light source emits a ring-shaped light beam and irradiates the cornea 1 of the human eye, and after being reflected by the cornea of ​​the human eye, passes through the After the imaging mirror group is finally imaged on the CCD camera module, a ring image is obtained. The ring image is processed by the image processing software installed in the processor and then displayed on the display screen. The image processing software is used to process the ring image...

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Abstract

The invention discloses a method for correcting corneal curvature instrument system astigmatism to correct the system astigmatism of a corneal curvature instrument. According to the method, noise filtering, binaryzation and edge extraction processing are carried out on a standard eye CCD image, centroids of all parts of an annular image divided according to angles are solved, the oval of the annular image is fitted, the mapping relation of corresponding points of the fitted oval and the excircle is calculated, the system error is obtained, and then the error correction is carried out on the actual measurement. The method has the advantages that the correction process is fast and accurate, and system hardware does not need to be modified.

Description

technical field [0001] The invention relates to a method for correcting astigmatism of a keratometer system, in particular to a method capable of rapidly and accurately correcting the astigmatism of a keratometer system without changing system hardware. Background technique [0002] The keratometer is used to measure the curvature of the cornea and is an important measuring instrument for ophthalmology diagnosis and treatment. The keratometer can measure the curvature of the front surface of the cornea, which provides a basis for selecting the appropriate soft contact lens base curve, and can also check the degree of corneal astigmatism through the keratometer, providing a reference for optometry. [0003] At present, the more successful keratometers on the market include Nidek AR310A, Cannon R-F10, Topcon RM-800 and Zhongbei Xinyuan FA-6500, etc. The basic measurement principle is : Use the annular diaphragm to generate a ring-shaped light beam and irradiate it on the corn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/107G06T5/00
Inventor 陈友华李晋华张敏娟李晓陈媛媛王志斌
Owner ZHONGBEI UNIV
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