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Cornea topographic map measurer

A technology of corneal topography and measuring instruments, which is applied in the field of medical measurement systems, can solve problems such as powerlessness, and achieve the effect of high resolution and high measurement accuracy

Inactive Publication Date: 2008-09-10
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (3) The system is incapable of changing the curvature of the cornea in the radial direction

Method used

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  • Cornea topographic map measurer

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Experimental program
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Embodiment Construction

[0028] Such as figure 1 As shown, the present invention includes a light source 1, a beam expander system 42, a focusing objective lens 21, a beam reducer system 43, a Hartmann sensor 44, a point spread function monitoring channel 45, a pupil imaging channel 46, a visual target matching optical path 47, and wavefront processing machine 23; the laser beam emitted by the light source 1 forms a parallel beam through the beam expander system 42, and the parallel beam passes through the first beam splitter 5, the second beam splitter 10, the third beam splitter 11, and the fourth beam splitter in turn after being turned by the reflector 48 The lens 20 arrives at the focusing objective lens 21 behind, after focusing through the focusing objective lens 21, it irradiates to the outer surface of the human eye cornea 22 within the focal point of the focusing lens 21, the average curvature center of the human eye cornea 22 coincides with the focus of the focusing lens 21, and is captured...

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Abstract

The invention provides a corneal topography measuring apparatus which can precisely measure curved transition of radial direction and tangential direction of cornea and comprises a Hartmann sensor, a focusing object lens and matching optical paths such as a light source, expanding beam, contracting beam, monitoring and controlling of point spread functions, pupilla imaging, an object, etc. The reflected light on the outer surface of the cornea is gathered by the Hartmann wave front sensor that is conjugated with cornea face after being propagated through an optical system, wave front aberration is obtained after wave front treatment and then a corneal topography is obtained. The matching paths finish auxiliary work of object alignment, object fixation, etc. The corneal topography measuring apparatus of the invention can not only measure information of the surface of the cornea in a large area but also have higher resolving power and measurement accuracy.

Description

technical field [0001] The invention relates to a medical measurement system for measuring corneal topography, in particular to a corneal topography measuring instrument. Background technique [0002] Corneal topography is one of the indispensable information in ophthalmology diagnosis and treatment. In recent years, with the successful application of the Hartmann wavefront sensor in measuring the overall aberration of the human eye, it reflects the broad prospects for the application of the Hartmann wavefront sensor in the measurement of the human eye. [0003] A common human eye aberration meter for measuring human eye aberrations, such as Figure 4 As shown, it is composed of light source 24, beam expander system, beam reducer system, Hartmann sensor 40, pupil imaging channel, visual target matching optical path, and wavefront processor 41. Its working principle is: the light emitted by light source 24 passes through the The beam expander system that the first lens 25, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/107
Inventor 杨金生饶学军张雨东饶长辉
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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