kératoscope - translation to french
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kératoscope - translation to french

OPHTHALMIC INSTRUMENT USED TO ASSESS THE SHAPE OF THE ANTERIOR SURFACE OF THE CORNEA
Keratoscopy; Placido's disk; Placido disc

kératoscope      
n. keratoscope, device which measures the symmetry of the curvature of the corneas (Ophthalmology)
kératoscopie      
n. keratoscopy, measuring of the curvature of the cornea by means of a keratoscope (Ophthalmology)

Wikipedia

Keratoscope

A keratoscope, sometimes known as Placido's disk, is an ophthalmic instrument used to assess the shape of the anterior surface of the cornea. A series of concentric rings is projected onto the cornea and their reflection viewed by the examiner through a small hole in the centre of the disk. A regular-shaped cornea should show equally spaced symmetric reflections. If the patient is suffering from astigmatism or from a corneal dystrophy, the rings will be distorted.

A modern development of the concept is found in corneal topography, in which analysis of the reflected image is passed to a computer. The automated instrument can produce colour-coded contour maps of the eye's topography or even three-dimensional visualisations of its surface.