Abstract: A visual stimulation method and system for the field of electrophysiology of vision to obtain the suppression of the recording artifacts due to the luminance transients of the LCD monitors during the inversion of a main stimulation pattern (17) composed of a plurality of geometric elements, each of which is represented by a pair of complementary micropatterns (21, 22) and where the micropattern of each pair alternate between them in a synchronised manner with the frame rate.

Abstract: A method and apparatus for visual stimulation and recording of the pattern electroretinogram (PERG) and of the visual evoked potentials (VEP), by way of transient and steady-state visual stimuli, including a simultaneous transient and steady-state stimulation of a plurality of zones of the visual field visualization element, and an algorithm able to reconstruct the second harmonic component of the steady-state signal and the transient signal of the zones.

Abstract: This invention relates to an optimization method for driving a piezoelectric actuator by dynamic detection of its electromechanical characteristics, as well as to a device, in particular a phacoemulsifier based thereupon. The piezoelectric actuator includes a voltage driven, two-terminal piezoelectric transducer. The method for detection of its electromechanical characteristics is such that the drive of the transducer is cyclically discontinued in order to detect the characteristic parameters of its free motion by detection of the parameters of the signal generated by the transducer at the ends of the two terminals.