7
3. Description of the structure
3.1 Description of the front panel
Fig.1
F1. Measuring Window
The working window of the testing personnel.
F2. Optic Distance Knob
It is used to conduct conversion of measured value of pupillary
distance at different optic distances of 30cm ~
∞
.
F3. Left Pupil Measuring Key
It is used to measure left pupillary distance. Sliding the key to the
outer side will make pupillary distance pointer move in opposite
direction of the nose bearer. At this time, the left eye pupillary
distance and binocular pupillary distance rise in numerical value.