LEADING EYE (synonym: the dominating, prevailing, prevailing eye) — the eye which is functionally prevailing at solid vision. This dominance is expressed, e.g., in the following: the visual line B. of of the first goes to subject to fixing and defines localization of a visual object in space; V. turns on the mechanism of accommodation earlier; Century of are neutralized indistinct details of images of the subordinated eye, and at division of fields of vision of both eyes it provides clearer vision of a subject, than the subordinated eye.
V.'s phenomenon of — one of manifestations of functional asymmetry, to some extent inherent in all pair analyzers. Visual asymmetry results from a combination of anatomo-optical features of an eye and the central influences (inductive processes in the cortical ends of monocular systems). Century of forms at the child in development and acquisitions of individual experience; takes place at 80% of children of 8 — 9 years and at 92% of adults.
The objective way of definition of V. of is most reliable: investigated becomes before a lamp, holds a pencil in an outstretched arm and blocks them a light source; at the same time the shadow from a pencil falls on V. If there is no V.'s phenomenon of a, at numerous repetition of a research the shadow lays down alternately on right, on the left eye.
See also Solid vision .
Bibliography: Avetisov E. S. Protection of sight of children, M., 1975; Zaksenveger R. Anomalies of stereoscopic sight at squint and their treatment, the lane with it., M., 1963, bibliogr.; L and t and N with to and y G. A. Functional asymmetry of eyes, Russian oftalm, zhurn., t. 9, No. 4, page 450, 1929, bibliogr.; Sergiyevsky L. I. Concomitant strabismus and heterophoria, M., 1951, bibliogr.
E. S. Avetisov.