[Pay attention to application of pupil reaction testing in assessment of neuro-ophthalmologic disorders]

The pupillary light reaction represents the functions of either the afferent visual pathway or the pupillary efferent innervations (parasympathetic and sympathetic). Physiologic and pathologic changes of pupil were usually ignored by the physicians. A correct pupil reaction testing will be of benefit to catch the abnormal pupil reaction as well as the early diagnosis of neuro-ophthalmologic disorders. A precise pupil reaction test is hardly performed because of the variation of individual, illumination and the instantaneous change of pupil. The proper pharmacologic testing is helpful for choosing the right neuro-electrophysiological and neuro-image examinations, and also may be of instruction value on the diagnosis of neuro-ophthalmologic diseases.