The present disclosure relates to a feedback system for control or input gestures in a medical environment, which includes a presence detector which generates a threshold and acquires detection data which describe whether a medical input gesture reaches and/or crosses the threshold and the extent to which the gesture has passed the threshold and a computer which is connected to the presence detector and triggers a sterility-preserving response to a positive detection by the presence detector including information how dangerous the situation is becoming with regard to non-sterility. The invention also relates to a medical image display system comprising such a feedback system and to a method of providing sterility-preserving feedback with respect to control or input gestures in a medical system.
