20
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Hold a contact lens with tweezers. Be careful not to press the lens with lens pressing unit.
d. Align the contact lens, pushing its end lightly with tweezers tips.
e. Get measured result by pressing Read key after alignment
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Auto Read mode is not working for contact lens measurement, which can only be achieved by
pressing Read key.
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Among measured data, a SE value will be displayed, which is 1/2 of the cylinder value added
to the sphere value. When a non-cylindrical contact lens is measured and still a cylinder value is
detected, the SE value will be more reliable than the SPH value to know the total sphere value. It
reduces the error in the measured data made by the unintended cylinder value.
f. Measure other lens if necessary.
g. Print out measured result.
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Measure a soft contact lens as quickly as possible before the lens surface becomes dry.
Because the lens contains water and is made of soft material, the lens cannot stay spherical for a
long time, altering the measured data.
6.7 PD and PH measuring
In Auto measurement mode, detailed steps of PD and PH of framed lens are shown as below:
a. Press Measurement function switch shortcut tab to choose PD and PH measurement function.
b. Set the framed lens
1) Place the framed lens center on the lens support. Raise the lens pressing unit, and then lower it
slowly to fix the lens.
2) Turn the lens pushing board lever. Press down nose pad slider of instrument to make sure it
fixed on the two nose pad of the lens frame. The lens pushing board lever touches and parallel
the bottom of the frames.
3) Right lens measurement
Move the right lens. When the alighment and the measurement data is finished, the PD/PH of the