Peripheral stimuli and stereoacuity under water

A variety of attempts were made to improve stereoacuity under water by providing limited additional peripheral stimulation. It was concluded that acuity is most improved when the peripheral stimuli are at the same distance from the o as the target. As the peripheral stimuli are moved closer to the 0 than the target, their beneficial effects are decreased, and beyond a certain point, their presence degrades acuity. This effect seems to be enhanced by increasing turbidity of the water, which decreases the contrast of the distant target relative to that of the nearby peripheral stimuli. These and previous findinp implicate several distinct processes in the degradation of stereoacuity in the water.