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  • spherometer An instrument for measuring the radius of curvature of a spherical lens or mirror surface. It may consist of a ring resting on the surface, with a micrometer plunger in the middle of the ring to measure the sag of the surface from the plane of the...
  • lens measure A tool used to determine the curvature of a lens surface in terms of dioptric power. See lens watch; spherometer.
  • lens watch A dial depth gauge graduated in diopters; a lens measure.
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