Prevalence and Characteristics of Positional Nystagmus in Normal Subjects

Conclusion
Positional nystagmus is a common finding in normal subjects and occurred in 88% of the healthy subjects in the present study. Horizontal direction-changing apogeotropic or geotropic nystagmus may occur in asymptomatic subjects. However, nystagmus that is of the paroxysmal type or has a slow-phase velocity greater than approximately 5° per second in the horizontal plane or 6.5° per second in the vertical plane should be considered outside the 95th percentile.

Source: Otolaryngology - Head and Neck Surgery - April 28, 2016 Category: ENT & OMF Authors: Martens, C., Goplen, F. K., Nordfalk, K. F., Aasen, T., Nordahl, S. H. G. Tags: General Otolaryngology Source Type: research