Placido disk


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Placido disk

(plă-sē′dōz)
[Antonio Placido, Portuguese ophthalmologist, 1848–1916]
A disk marked with concentric black and white circles used in determining the amount and character of corneal irregularity.
Medical Dictionary, © 2009 Farlex and Partners

Placido da Costa,

Antonio, Portuguese ophthalmologist, 1848-1916.
Placido da Costa disk - an instrument marked with lines or circles, used to observe the corneal reflex. Synonym(s): Placido disk; Placido keratoscope
Placido disk - Synonym(s): Placido da Costa disk
Placido keratoscope - Synonym(s): Placido da Costa disk
Medical Eponyms © Farlex 2012
References in periodicals archive ?
In a previous study, a limitation by the level of aberration of some internal aberrometric parameters (subtraction of corneal to total aberrations) measured with an integrated system combining a Hartmann-Shack aberrometer and a Placido disk corneal topographer has been reported [20].
[33] enrolled 43 consecutive patients who were scheduled to undergo phacoemulsification to evaluate the accuracy of the Galilei dual Scheimpflug analyzer and a Placido disk corneal topography system (Optikon 2000 SpA; Keratron, Italy) for IOL calculation, which found that corneal power measurements provided by the Scheimpflug camera and Placido disk corneal topographer obtained accurate IOL power calculation.
The Sirius system (Phoenix, Costruzione Strumenti Oftalmici) is a new topography device which has combination of 2 monochromatic, 360-degree rotating Scheimpflug cameras and a placido disk. Reliable and consistent measurements between devices are crucial because they help clinician in the diagnosis, followup, and treatment of keratoconus [7].