Grading standard of visual disability.

Cited from Documentation of the Second China National Sample Survey on Disability, 2007.Notes: (1) Blindness or low vision refers to both eyes. In the event that the degree of the two eyes were different, only the eye with better vision was considered. If a person had one eye that was considered to be blind or to have low vision but the other eye was not recognized as visually disabled (greater than 0.3), then that person was excluded from this analysis. (2) The optimum corrected vision referred to the best vision after appropriate eyeglass rectification or vision measured by pinhole glass. (3) Persons with field of vision less than 10 degrees were recognized as visually disabled.数据引自《2007年第二次全国残疾人抽样调查文档》。注释：(1) 盲或低视力均指双眼而言；若双眼视力残疾程度存在差异，则以视力较好的一眼作为判定标准。若仅单眼被认定为盲或低视力，而另一眼视力优于0.3，则该人员不纳入本次分析。(2) 最佳矫正视力指经适当配镜矫正后获得的最优视力，或通过针孔镜测得的视力。(3) 视野半径小于10度者，将被判定为视力残疾。