Keratoscope
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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.
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It sits within the topics Ophthalmic equipment and Ophthalmology.
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Key facts
- Diagnostic.name
- Keratoscope
- Diagnostic.image
- File:Placidos keratoscope 10.JPG
- Diagnostic.caption
- A keratoscope
- Diagnostic.purpose
- assess shape of cornea
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Encyclopedic overview
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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.
Excerpted from Wikipedia’s “Keratoscope” article, available under the CC BY-SA 4.0 licence.