The eye tracking test (E. T. T.) is usually evaluated in terms of the alternating wave pattern and the velocity or frequency of the eye movements.
This way of testing has, however, ignored the mutual relationships among the amplitude, velocity and frequency of the wave.
A triangular wave has been used to clarify these relationships.
Ten normal persons were gathered randomly. No significant neurological defects were recognized in their histories. Their age ranged from 24 to 48. The sex ratio of male to female was 8 to 2.
Binocular recordings were taken on all the 10 subjects on a D-C ENG in frequencies of 0.1, 0.3, 0.5, 0.8 and 1 Hz with amplitudes of 10°, 20°, 30°, 60°, and 90°. The velocity was calculated mannually from D-C ENG recording data.
The results obtained are as follows.
1) The E. T. T. is influenced mostly by the frequency but not by the velocity or amplitude itself of the target.
2) Alternating wave patterns begin around 0.5-0.8Hz in which saccadic eye movement is supposed to be mixed in smooth pursuit eye movement.