[TV-pattern reversal stimulus (VECPs) in determination of refraction (author's transl)].

Pattern reversal VECPs show a dependence on visual acuity and therefore are suitable for objective determination of refraction, this method, however, was of limited clinical use for two reasons, as, on the one hand, the required impulse parameter was difficult to change using the traditional mechanically functioning pattern stimulator and, on the other hand, diagnosis war very timeconsuming. Using a pattern impulse picture presented on a monitor by an electornic impulse apparatus all impulse parameters can easily be changed and throught he introduction of a microprocessorsystem the evaluation can be observed on-line.