Congenital nystagmus is a spontaneous pendular or jerk nystagmus present at birth and continuing throughout life. Etiology of congenital nystagmus is not cleary defined but some appears familiar or hereditary pattern. Unlikely that in any other condition congenital nystagmus continues even when the eyes are turned laterally and closure of the eyes result in a marked reduction in the nystagmus, and so darkness with eye open and closure result in same results. Patients of congenital nystagmus accommodate well to these abnormal eye movements and the only clinical significance is that congenital nystagmus should not be confused with a pathologic nystagmus. Therefore, it is important to carefully question both the patient and the family about the time of onset and duration of persistant nystagmus. Sometimes, periodically alternating nystagmus and latent nystagmus may appear in congenital nystagmus. The authors recently experienced 5 cases of congenital nystagmus, so we report these cases with review of literatures.