ker·a·to·scope (k r  -t -skp )n. An instrument marked with lines or circles for use in examining the curvature of the cornea. Also called Placido's disk. |
keratoscope [ker´ah-to-skōp″]
a device consisting of alternate black and white concentric circles and used for examining corneal curvature.
keratoscope
an instrument for examining the cornea.
keratoscope
Instrument for examining the front surface of the cornea. It consists of a pattern of alternately black and white concentric rings reflected by the cornea and seen through a convex lens mounted in an aperture at the centre of the pattern. Such an instrument gives a qualitative evaluation of large corneal astigmatism, and is useful in cases of irregular astigmatism as in keratoconus, for example (Fig. K3). Syn. Placido disc. See corneal topography; photokeratoscopy; videokeratoscope.
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Fig. K3 Keratoscope
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