Abstract: The invention relates to a method and apparatus for detecting human eye defects, particularly detection of refractive error. The invention operates by recording on color film the eye reflex which occurs when eyes are exposed to a flash of light. The photographs are compared with predetermined standards, to detect eye defects. As shown in FIGS. 1 and 2, the base structure of the ocular screening system (10) is folding interconnect structure (12), comprising hinged sections (14), (16), and (18). Attached to one end of structure (12) is head positioning station (24) which comprises vertical support (26), a head positioning bracket (28) having one end attached to the top of support (26), and two head positioning lamps (33) to verify precise head positioning. At the opposite end of interconnect structure (12) is a camera station (34) with camera (38), electronic flash unit (44), and blinking fixation lamp (46), for photographing the eyes of persons being evaluated.

Abstract: This invention is of a traffic survey system in which an aerial photo survey transparency is first made of a significant survey area, for example, two kilometers square. The transparency is then optically scanned to check the position and size of vehicles on roadways in the area. By computer control comparison with a reference transparency wherein areas other than roadways are made opaque and roadways are made clear, scanning may be directed solely to roadway regions. Vehicle size analysis is accomplished by means of discrete holographic filters corresponding to selected size vehicles.