The invention relates to the technical field of short-distance and long-distance
eye position and AC / A detection, and discloses a portable short-distance and long-distance
eye position and adjustability set-adjustment ratio
screening instrument which integrates a first mode, a second mode and a third mode, the first mode is long-distance
eye position detection, the second mode is short-distance eye position detection, and the third mode is AC / A ratio detection; the
screening instrument is of a binocular
telescope structure, and a set of fixed separation prisms, a set of rotatable annular prisms and a set of + 1.00 D spherical lens additional
system are arranged on the binocular
telescope structure. A distance conversion
system, a sighting mark projection module and a control button. The
screening instrument has the characteristics of portability,
operability and low cost, is suitable for daily detection of individuals and medical institutions, has a
modular structure, is convenient to clean and maintain, and ensures the
sanitation of the detection process and the reliability of data. The screening instrument is also suitable for being popularized and used in
community health general survey, and provides a reliable auxiliary tool for
visual function health screening.