Prescription AnalysisQuestion 44 of 100
Hand neutralization of an unknown lens uses what technique?
a.Measuring edge thickness
b.Weighing the lens
c.Moving the lens and observing target movement to add opposite power
d.Reading the frame stamp
Explanation
In hand neutralization, an optician moves the lens across a target line; the direction of apparent movement indicates plus or minus, and trial lenses of opposite power are added until movement stops.
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