From Big Medical Encyclopedia

DIVERGENCE OF EYES (pozena of armor. divergentia discrepancy) — discrepancy of visual axes of both eyes. Distinguish absolute and relative D.

Absolute divergence of eyes (a deviation of visual axes of both eyes of a knaruzha from their parallel situation) arises during sleep, an anesthesia, and also at the dispersing (diverging) squint.

the Scheme of a path of rays at the relative divergence of eyes which is shown in discrepancy of visual axes in relation to their initial situation. I \less remote subject, II — more remote subject during the movement of a look of which there is a relaxation of the akkomodatsionny device of an eye and movement of visual axes (dashed lines).

Relative divergence of eyes (discrepancy of visual axes of both eyes concerning their initial situation) it is normal observed during the movement of a look of more remote subject (fig.); results from irritation of nasal departments of retinas of both eyes, and also in case of an exophoria (see. Heterophoria ) at an exception of conditions for solid vision. Relative D. is followed by the corresponding relaxation accommodations of eyes (see).

Of often call a negative phase convergences of eyes (see).

The maximum D., at a cut still perhaps binocular merge of images, characterizes the size of negative fusional reserves (a fuziya — merge of the images of the fixed subject received on a retina of both eyes in a uniform visual object — see. Fuziya ). It is defined by a pristavleniye to an eye of prisms (the basis to a nose) or on special devices (sinoptoform, etc.). Normal negative (divergent) width of a fuziya (see. Squint ) makes for a distance 7 — 8 dptr and for a bliza 16 — 18 dptr.

Bibliography: Physiology of touch systems, under the editorship of A.S. Batuyev, page 143, L., 1976; S with h about b e r H. Das Sehen, Bd 1, S. 123, Lpz., 1960.

E. S. Avetisov.