2
measurement system, optical system, ESS and microcomputer into a
whole.
＊
Using mechanical hairspring to level at the re
fl
ecting point of
human cornea to realize the consecutive measurement. It features
directness of point-sampling and high accuracy of orientation.
＊
Adopting line-shaped sensors of high definition, advanced
intellectualized electronic systems and digital display which allow
the testing results more visible, legible and accurate.
＊
LED lamp-house and a design of low-power consumption ensure
the prolonged service life of batteries.
＊
PD and VD measurement is available.
＊
It offers the +2.00D compensation for the degree of eyesight.
＊
The brightness of LED lamp-house is adjustable.
1.3 Main technical indexes
1.3.1 Effective range of measurement
Binocular pupillary distance: 45mm ~ 82 mm
Left or right pupillary distance: 22.5mm ~ 41 mm
1.3.2 Indication error:
≤
0.5mm
1.3.3 Asymmetrical error:
≤
0.5mm
1.3.4 Distance of target: 30cm ~
∞
1.3.5 Power source: Voltage: DC 3V
Speci
fi
cation: 5# AA battery
Quantity: 2 pieces (2×1.5V AA batteries)