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4.2 Measurement of Lens
4.2.1
Measurement of Spherical Lens
1.
Confirm the mode of cylindrical lens measurement, and turn diopter
measuring hand-wheel to obtain distinct drone focus.
Prompt
If it is mode of cylindrical lens measurement, press measurement switching key
S/C to switch it to mode of cylindrical lens measurement, the device will sends
out sound of “DuDu” simultaneously.
2.
Lightly move lens so that drone is at center of eyepiece visual field. Then
finely regulate diopter measuring hand wheel to obtain clearest focus of drone.
At this time, the number on the liquid crystal display screen is just the spherical
diopter of this lens (Fig. 10).
Fig. 10
4.2.2
Measurement of Cylindrical Lens
Cylindrical lens means astigmatism lens. Usually its external surface is spherical
and interior surface is cylindrical or drum-shaped (i.e. interior astigmatism).
Refractive power on each section of its interior surface is different, in which, there
