Papelba G., Ozolinsh M.

Department of Optometry and Vision Science, University of Latvia, LATVIA

Purpose: The main goal of this investigation was studies of the stereovision threshold under static and dynamic conditions. These stimuli were blurring (with electrooptic PLZT ceramic) of the stimulus for one eye.
Methods: Studies in static and dynamic conditions of correlation between the decrease of the monocular acuity and the stereothreshold using a light scattering obstacle placed between one eye and a random dot stereopair. The obstacle made of electrooptic PLZT ceramics provided a continuo quasistatic and dynamic change of blurring of a retinal image, thus decreasing the contrast of the stimulus. Subject must determine the figure with the highest stereoangle seen when the light scattering is dynamically switched on.
Results: By increasing intensity of blurring, the stereoacuity and the visual acuity remain constantly. Contrast vision is sensitive to minimal change of blurring. Achieving critical point, where U/U(vs=0,5) = 0.68 the stereoacuity and the visual acuity start to change gradually (the stereoacuity increases, but the visual acuity decreases), but contrast vision in the critical point is declined approximately to half.
Conclusion: Contrast vision is more sensitive to the intensity of blurring than visual acuity. Quality of stereovision strongly depends on intensity of blurring and frequency of blurring appearance. It seems that, change of contrast vision is the most affecting to stereoscopic vision.

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