Definitions for keratoscope

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  1. keratoscope(noun)

    medical instrument to examine the cornea in order to detect irregularities in its anterior surface

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  1. Keratoscope

    A keratoscope, sometimes known as Placido's disk, is an ophthalmic instrument for assessing the shape of the anterior surface of the cornea. A series of concentric rings are 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.

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