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[Back part]
1. Forehead rest: location for placing the forehead to prevent test subject from moving the face
(Type B attachment part)
2. Measuring window: object lens for measuring the image that is formed in the eye retina
3. Chin rest: location for placing the chin to prevent test subject from moving the face
(Chin rest paper: Type B attachment part)
4. Chin rest control knob: the chin rest’s height adjustment knob
5. Measuring head: Optical head of mearing.
6. Eye height mark of measuring window: indicates the position of the measuring window.
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