A method for measuring eye movements using Hall-effect devices.
A system for precise recording of eye position and movements in laboratory animals, by means of Hall-effect devices, is described. The system, useful in neurophysiological and neurobehavioral studies, allows the analysis of saccadic eye movements, optokinetic- and vestibular-induced nystagmus, slow tracking movements, eye vergences, and so forth. This small, light-weight, and inexpensive system uses a set of Hall-effect devices and associated electronics to sense variations in the position of high-power magnets fixed in the eye sclera or in scleral contact lenses. The output of the Hall-effect devices is amplified by operational amplifiers, collected through an A/D converter, and analyzed in a PC computer by specific software.
Salas
C
C
Universidad de Sevilla, Spain. cosme@cica.es
Torres
B
B
Rodríguez
F
F
D000818:Animals; D004594:Electrophysiology / Q000379:methods; D004867:Equipment Design; D005133:Eye Movements; D006054:Goldfish; D006801:Humans