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diopsimeter

[dahy-uh p-sim-i-ter]
noun Ophthalmology.
  1. an instrument for measuring the field of vision.
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Origin of diopsimeter

di-3 + Greek ops- (stem of ópsis) sight, vision + -i- + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018