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Lens clock
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<p>A lens clock is a mechanical <a href="/facts/Dial_indicator/fMmNsjQ8">dial indicator</a> that is used to measure the <a href="/facts/Dioptric_power/jmIWyX25">dioptric power</a> of a <a href="/facts/Lens_(optics)/ejlH6n5c">lens</a>. It is a specialized version of a <a href="/facts/Spherometer/fIt4fNY3">spherometer</a>. A lens clock measures the <a href="/facts/Curvature/RFCAEsj8">curvature</a> of a surface, but gives the result as an <a href="/facts/Optical_power/jmIWyX25">optical power</a> in <a href="/facts/Diopter/as62tso3">diopters</a>, assuming the lens is made of a material with a particular <a href="/facts/Refractive_index/yjkzvgeE">refractive index</a>. </p>