ABSTRACT
Evaluation of visual impairment is the fundamental research of visual impairment standards and appropriate application. In the absence of basic study, impairment standard is in the trouble of formulating, understanding and apply, the accuracy and scientific of appraisal opinion is also weakened. The following five key problems should be resolved above all, definition of visual function of disability, the proportion between visual impairment and individual dysfunction, appropriate examinations, quality of life investigation of disability and the integrated measure of vision damages. Assessment research and cross-over study of law, forensic science and clinical medicine should be enhanced. Developing of impairment evaluation theory is needed to the standardization and standardization of permanent impairment assessment guides.