Instruments & Regulatory第 89 / 100 题
A Geneva lens clock (lens measure) reads what?
a.Lens power in the eye
b.Pupillary distance
c.Surface curvature (base curve) of a lens
d.Prism amount
解析
A lens clock, or Geneva lens measure, uses three pins to measure the sag of a lens surface and reports the surface curve in diopters, commonly used to check base curve and detect warpage.
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