but a new study finds it may cause a potentially dangerous optical illusion. Nearly a century ago German physicist Carl Pulfrich described a visual phenomenon now known as the Pulfrich effect ...

Many visual symptoms originating from a spontaneous Pulfrich ... the illusion is chosen. The choice is confirmed by checking that no symptoms are experienced when swinging the pendulum in the ...

Study of the visual Illusion known as the Pulfrich phenomenon with random dot stereo movies confirms that the filtering of one eye in effect introduces a delay in the system for that eye ...