Contact lens fitting for binocular micromovement recording.

Specially designed hard contact lenses for binocular micromovement recording were tested under static and dynamic conditions. In order to overcome contact lens adherence in fitting 0.2 mm below mean keratometer reading, forces of 70 g were necessary (weight of contact lens 0.058 g). In dynamic testing of induced sinuswave and original micromovement on an experimental globe, pattern identity and synchronism of globe and contact lens are given. Closely spaced saccades were recorded without deformation. Difference in amplitude is due to detector irregularity. Computer calculated time difference in saccadic onset was below 0.003 s. Therefore, requirements are met for micromovement recording in clinical cases and the reliability is outlined.