Evaluation of facial palsy by Moiré topography.

To evalute facial nerve function, several visual assessment methods have proposed by May, Yanagihara, Stennert, House, Brackman, among others, and the score method is widely accepted as a simple and useful method for examination to evaluate roughly the degree of facial palsy. However, it is difficult to capture fine changes with the score method when precise evaluation is required, and it is limited as a form of objective and reporducible assessment. Therefore, it is not a very suitable method to follow up the process of the recovery in facial nerve palsy.