8
Sliding the key to the inner side will make the pupillary distance
pointer move towards the direction of the nose bearer. Now
numerical value of the pupillary distance decreases.
F4. Function Transition Key
PD and VD measurement mode can be switched by pressing
Function Transition key. Besides, it can be used to set LED
brightness, automatic power-off time and measurement precision.
F5. Display Window (as shown in Fig.2)
It displays the measured numerical value of PD or VD, and some
other relevant information.
Fig.2
*When reading information on the display window, the Right value
denotes the distance between center of nose bridge and right eye
pupillary distance or VD of the right eye, and the Left value denotes
the distance between center of nose bridge and left eye pupillary
distance VD of the left eye. PD value stands for the distance between
left eye pupil and right eye pupil. The unit is mm.