Another of the devices used in the psychological diagnosis of visual receptor efficiency. It allows you to specify a bottom threshold of visual sensitivity. Illuminating system design makes a test result independent from the properties of the room. It meets the conditions of the diagnostic objectivity. Equipped with a system for programming the exposure parameters, including:

dimensions of the displayed optotype, black saturation, contrast between an optotype and a background and illumination time. It is mainly used in psychological testing of vehicle drivers. It can be connected directly to the Noctometer.

Optionally, the device can be equipped with a tripod.