Ocular Nystagmus Recorded Simultaneously in three Orthogonal Planes

Abstract

A cine-photographic method for simultaneous recording of eye movements about three axes at right angles to one another is described. The apparatus comprises a forward-facing cine camera mounted on one side of a helmet which can be fixed to the skull by a dental bite. A periscope is attached to the lens in such a way that the camera takes a close-up picture of one eye. A semi-automatic analyser subsequently resolves and prints out the ‘horizontal”, ‘vertical”, and ‘rolling” components of eye movements relative to the skull by making frame-to-frame measurements of eye displacement on the cine film records.

The method is accurate to approximately ±0.5° for eye movements in ‘horizontal” and ‘vertical” planes and ±1° for ‘torsional” eye movements about the visual axis.