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目的应用减视年数（ｐｏｔｅｎｔｉａｌｙｅａｒｓｏｆｖｉｓｉｏｎｌｏｓｔ，ＰＹＶＬ）指标分析四川省因角膜病致盲的危害程度。方法采用《四川省１９８６年盲目和低视力流行病学调查》资料进行减视年数指标分析。结果四川省因角膜病致盲的减视年数率高于白内障致盲的减视年数率，不同于患病率的结果是后者高于前者。结论减视年数指标可以反映不同年龄视力损失程度的群体和个体差别。角膜病是防盲工作的重点。
Objective To investigate the extent of blindness caused by corneal disease in Sichuan Province by using the indicators of the number of years of impotence (PYVL). Methods The data of “blindness and low vision epidemiology survey in 1986” in Sichuan Province were used to analyze the indicators of the number of years of reduced vision. Results The annual incidence of deafness due to corneal disease in Sichuan Province was higher than the annual rate of degeneration of blindness in cataract. The difference between the two was that the latter was higher than the former. Conclusion The indicators of the number of years of reduced vision can reflect the differences of groups and individuals in the degree of vision loss at different ages. Corneal disease is the focus of anti-blind work.