Plácido's disk

noun Ophthalmology.
a device marked with concentric black rings, used to detect corneal irregularities.

after A. Plácido da Costa (1848–1916), Portuguese ophthalmologist, who devised it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

Placido's disk Pla·ci·do's disk (plä-sē'dōz, plä'sē-duz)
See keratoscope.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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