Fig. 7
From: New pediatric vision screener, part II: electronics, software, signal processing and validation
The examination procedure. Without head restraint, the child is seated on a chair or in the parent’s lap, while the operator aims the instrument from a distance of 33 cm (± 1 cm) using built-in triangulating laser pointers converging on the bridge of the nose. During the exam, the child sees the flashing fixation target within the aperture of the instrument, (accompanied by synchronous sound), and the scanning circle