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opto-

  1. a combining form meaning “optic” or “vision,” used in the formation of compound words: optometry.
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Origin of opto-

< Greek optós visible; akin to ṓps face; cf. eye
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

opto- in Medicine

opto-

pref.
  1. Eye; vision:optometry.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.