^{Printed deep vision testerfunctionfeature}
I. Overview
The deep vision tester is mainly used to detect the perceptual ability of subjects to distinguish the deep motion of objects, and is one of the main indicators of visual function.
2、 Working principle and structural composition
The deep vision tester adopts the commonly used three bar method both domestically and internationally. In the upright three bar system, the two bars on both sides of the main unit are fixed on the same straight line, and the middle bar can move at a constant speed forward and backward. The subject is allowed to sit down at a distance of 2.5 meters in front of the two fixed bars inside the main unit, and the lower forehead is stabilized by a bracket. The eyes are fixed on the moving bar through the observation window. When the middle bar moves to form a straight line with the other two fixed bars, the remote control switch or response button is immediately pressed and the test results are recorded, completing one test. In driving adaptability testing, it is generally stipulated that each person is tested three times in a row as one testing cycle, and the ability of the subject to distinguish deep motion of objects is judged based on the average error value.

3、 Function
1. Characteristics:
1) Can be numbered
To meet communication needs and distinguish different tested objects, this instrument has the function of receiving various numbers, with an effective number range of 0-9999999999
2) Having local display of test results
After each testing cycle is completed, when the operator presses the [OK] button, the number of times each round of testing and the test results of the current subject will be displayed on the monitor every 1 second.
3) There are two ways of working: practice and testing.
In the practice mode, after pressing the [confirm] button, the moving rod moves back and forth at a slow speed (25mm/s). When the subject presses the response button or remote control switch, the moving rod stops. After completing one exercise, the moving rod will continue to move and enter the next exercise. Press the button three times in sequence, the moving rod stops and resets, and the exercise ends with the results displayed.
In the testing mode, the moving rod moves back and forth quickly (50 mm/s), and the subjects are required to measure continuously three times. The test results are recorded by the tester or transmitted through communication.
2. Technical parameters:
1) Range of moving rod: ± 80mm relative to the centerline
2) Rod diameter: 3mm
3) Rod spacing: 30mm
4) Moving speed: 50mm/s (test), 25mm/s (practice)
5) Background light: 6v 12W
6) Test accuracy: ± 0.1mm
7) Working voltage: AC 220V ± 10%, 50HZ, power consumption: less than 140W
8) Working environment: Working temperature 0-40 º C, working humidity 85% (40 º C)
9) Touch printing (optional)