Development of dynamic vision based on motion contrast

The development of dynamic vision was investigated in 400 healthy subjects (200 females and 200 males) aged between 4 and 24 years. The test consisted of a computer-generated random-dot kinematogram in which a Landolt ring wa s briefly presented as a form-from-motion stimulus. Motion contrast between the ring and background was varied in terms of the percentage of dots movi ng coherently within the ring in four levels (100%, 50%, 30%, and 20%). The subject's task was to indicate the position of a gap in the ring (left, ri ght, top, bottom). Results show a clear increase in performance with age fo r all motion contrast levels, with the greatest changes for the lowest leve ls. Adult performance was reached at the age of 15 years. Luminance-based s tatic acuity measured with the Landolt test was poorly correlated with acui ty for its form-from-motion analogue.