[Accommodation as a biological system of automatic regulation]

Contour of the accommodation reflex was regarded as an analog of a closed system of automatic regulation. The gradient of impulses frequency in the visual fibers was taken as a criterion of estimation of anobject focused image on the retina. The data obtained when studying the accommodation contour in the regimen of the test-object fixation at different distances or at its insignificant (+/- 10 mm) sinusoidal displacement in regard to 2 fixated positions (200 and 460 mm), are discussed.