Abstract <p>A model of contrast sensitivity of the human visual system when perceiving sinusoidal gratings moving at angular speeds of up to 1000 degrees per second is considered. The model is built on the basis of a tremor modulation signal, which is taken to be the difference in the concentration of the photoreagent at the extreme points of the tremor, normalized to the level of adaptation. The model details the dependence of contrast sensitivity on physiological factors such as photoreceptor size, amplitude and frequency of tremor for adaptation brightness of 0.001–1000 cd/m². The model establishes a relationship between the results of measuring the contrast sensitivity of the visual system and the results of measuring natural tremor oscillations of the eyes during the perception of stationary and dynamic stimuli.</p>