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GA/T 1967-2021: Forensic medicine - Specifications for examination of visual electrophysiology
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GA/T 1967-2021: Forensic medicine - Specifications for examination of visual electrophysiology

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Forensic medicine - Specifications for examination of visual electrophysiology ICS 13.310 CCSA92 People's Republic of China Public Safety Industry Standards Specification for visual electrophysiological examination in forensic medicine Published on 2021-10-14 2022-05-01 Implementation Published by the Ministry of Public Security of the People's Republic of China

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. Please note that some content of this document may be patented. Publication of this document Institutions do not assume responsibility for identifying patents. This document is proposed by the Forensic Examination Sub-Technical Committee of the National Criminal Technology Standardization Technical Committee (SAC/TC179/SC6). focal point. This document is drafted by. China University of Political Science and Law Institute of Evidence Science, Institute of Forensic Science. The main drafters of this document. Wang Xu, Zhu Guangyou, Yu Lili, Xiang Jian, Chang Lin, Yu Xiaobing, Xia Wentao, Fan Lihua, Yang Yingkai, Shi Xiaoqian, Lu Weihualin, Mi Zhongliang, Zheng Tuo. Specification for visual electrophysiological examination in forensic medicine

1 Scope

This document specifies the terms and definitions, basic principles, technical specifications and result evaluation. This document applies to assessments involving objective examination of visual function in forensic clinical identification.

2 Normative references

There are no normative references in this document.

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 visualfunction The human body receives stimuli from the external environment through the peripheral sensory organs (eyes) of the visual system, and is encoded, processed and analyzed by the visual center. subjective feeling. Note. Generally, it includes light perception, shape perception, color vision, three-dimensional perception and contrast perception. 3.2 The visual-related electrical responses of different parts of the retina to the occipital optic center were examined by the clinical neuroelectrophysiological detection method. And record, the inspection method that can objectively measure the visual function of the human eye. Note. Generally divided into traditional visual electrophysiology and multifocal visual electrophysiology. Traditional electrophysiology includes. electroretinogram, visual electrooculogram, visual evoked potential. many Focal electrophysiology includes. multifocal electroretinogram, multifocal visual evoked potential. 3.3 Stimulation of the retina with flashes of light or graphics induces potential activity in the occipital visual cortex. Visually evoked potentials reflect neural The functional status of the visual pathway from ganglion cells to the visual cortex can objectively evaluate the visual pathway function. Note. According to the different ways of giving retinal stimulation, it mainly includes flash visual evoked potentials and graphic visual evoked potentials. flash visual evoked potentials Different stimulators are divided into Ganzfeld stimulated flash visual evoked potentials and Goggles eye mask stimulated flash visual evoked potentials. Graphic visual lure According to the different stimulation methods, the potentials can be divided into graphic flip visual evoked potentials and graphic give-withdrawal visual evoked potentials. 3.4 On the basis of recording steady-state visual evoked potentials, an objective visual acuity measurement method was developed. by recording multiple spatial frequencies The signal of the sinusoidal grating stimulus response is processed by synchronous filtering and discrete Fourier analysis, and the optimal regression of the amplitude-spatial frequency curve is calculated. The method of obtaining the minimum resolution threshold of visual acuity and calculating visual acuity. 3.5 Using CRT stimulators to stimulate the retina with flashes of light or graphics to reflect the electrophysiology of each tiny local signal characteristic of the retina ...