In judicial practice, some people only have a vague idea about the differences between the identification of body injury degree and evaluation of body impairment class.

Then,the change ratio of equivalent shear stiffness and the compositive sheer stiffness are used as the indexes for damage localization and damage severity estimation.

Evaluation for the degree of injury is a significant part of clinical forensic expertise.

·CONCLUSION: The diagnosis points affirming traumatic retinal detachment,including definite history of ocular injury ,and the degree of injury was severe,the degeneration of vitreous body and retina had not yet been found via the examination of ocular fundus.

For beam-type structures,a new index for identifying the damage location is developed and proposed based on the elemental strain energy change ratio before and after the damage of element,and the index for evaluating the damage extent is presented according to the relation between the modal strain energy change and the frequency change before and after the structural damage.