Examination of the peripheral field of vision with the waterfall phenomenon (motion stop reverse illusion).

With the help of a moving stripe-pattern, generated onto a monitor screen, adjusted to the peripheral visual acuity, a local stimulation in the peripheral field of vision of one eye was carried out. During this stimulation no optokinetic nystagmus was observed. After the stimulating objects were brought to a halt, brief movement sensations in the opposite direction appeared to take place. This is known in the vertical direction as the waterfall phenomenon. This phenomenon (called MSRI) also occurs after stimulation from other directions. It gives an impression of the sensitivity of the periphery of the retina to movement and may be of use in measuring the peripheral dynamic visual acuity.