Studies of time response of the vision binocularity by use of dynamic suppressing of retinal images

We present a novel technique for determination the stereopsis dynamic response, using as stimulus a random dot stereopair. Stereopsis can be evoked or depressed by continuous or flash illumination of the stimulus with simultaneous control of a special light scattering obstacle built in the visual path of one eye. The obstacle - a thin plate of electrooptical PLZT ceramics - exposes (by applying of the voltage to semitransparent gold electrodes deposited on both surfaces of the plate) light scattering so blurring the retinal image, similar as for an eye with a cataract, depressing stereopsis. The random dot stereopair contains contours of images with a different stereodisparity. The PLZT plates active (covered with electrodes and light scattering) part influences a part of the image of one eye so ensuring the continuous fusion of both eye stimuli and supplying a reference stereoimage in the clear region of the stimulus. The degree of blurring one can vary continuously by changing the voltage applied to the PLZT ceramics plate. The dynamically controlled light scattering induced in the obstacle has much greater switching speed (in sub-millisecond range) as compared with the human ocular and oculomotoric responses. The paper presents results of the psychophysical tests of the monocular visual acuity, of the dynamics of evoking the stereopsis, depending on the time-synchronised inducing of scattering, on the degree of blurring and on the stereodisparity of stimulus.