Dispersion speckle refractometer and method for testing myopic, hyperopic and astigmatic degrees

A speckle refractometer and diffuser screen technology, applied in the field of optometry, can solve the problems of staying in the research stage, limited accuracy, unable to meet the accuracy requirements of optometry applications, etc.

Inactive Publication Date: 2011-08-03
WENZHOU MEDICAL UNIV
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited precision of the simplified eye model used, and the need to measure a large number of individual parameters for the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dispersion speckle refractometer and method for testing myopic, hyperopic and astigmatic degrees
  • Dispersion speckle refractometer and method for testing myopic, hyperopic and astigmatic degrees
  • Dispersion speckle refractometer and method for testing myopic, hyperopic and astigmatic degrees

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0103] The present invention is specifically described below by the embodiment, only for further illustrating the present invention, can not be interpreted as the limitation of protection scope of the present invention, the technical engineer of this field can make some non-essential improvements and improvements to the present invention according to the content of the above-mentioned invention Adjustment.

[0104] Such as Image 6 , 13 As shown, it includes a laser 1, a half-reflective prism 2, a two-dimensional rotating mirror 3 that can rotate around a horizontal rotation axis and a vertical rotation axis, and a scattering screen 5. The laser 1 described in this embodiment is preferably HE -NE laser, the laser wavelength is 632.8nm, the half-reflective prism 2 and the scattering screen 5 are sequentially located on the laser emission direction of the laser along the optical path, and the two-dimensional rotating mirror 3 is located at the side of the half-reflective prism ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Wavelengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a dispersion speckle refractometer and a method for testing myopic, hyperopic and astigmatic degrees. The dispersion speckle refractometer comprises a laser, a half-reflecting half-transparent prism, a two-dimensional rotary reflecting mirror capable of rotating around a horizontal rotating shaft and a vertical rotating shaft, and a diffuser screen; the half-reflecting half-transparent prism and the diffuser screen are positioned in a laser transmitting direction of the laser along an optical path, and the two-dimensional rotary reflecting mirror is positioned in a reflected light transmitting direction of the half-reflecting half-transparent prism; a circular pupil sheet is arranged between the diffuser screen and an eyeball of a human body to be tested; and a light-transmitting diameter of the pupil sheet is 4 +/- 0.5mm, and a distance from the pupil sheet to a cornea is smaller than 6mm. The invention has the advantages that: the cost is low, and the operability and the practicability are good; the precision of testing parameters such as the myopic degree, the hyperopic degree, the astigmatic degree and the like is quite reliable; and inferential analysis on a patient glasses situation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of ophthalmology and optometry, and specifically refers to a speckle refractometer, which is a method for testing the degree of myopia, hyperopia and astigmatism of a human body by using the speckle refractometer. Background technique [0002] We know that when distant objects are imaged by non-emmetropic eyes (such as astigmatism or myopia), their focal point will deviate from the retinal position, so a blurred defocus circle (blur-circle) will be produced on the retina. According to this, people have Recognizing that refractive error will lead to changes in the shape of diffuse spots in the fundus, and deriving the calculation formula from the simplified eye [see Obstfeld H. Optics in vision[M].Vol 1st ed. London: Butterworth &Co Ltd ,1978. 58-99. ]. In the 1990s, Chinese scholars also proposed the idea of ​​using diffuse spots for optometry [see Li Xinru, Huang Xueping, Tao Yuhua, etc. [J]. Experimental ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): A61B3/036A61B3/032
Inventor 张逸夔黄胜海陶育华
Owner WENZHOU MEDICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap