Keratoscope

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 topology or even three-dimensional visualisations of its surface.


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  • keratoscope — keratoscopy /ker euh tos keuh pee/, n. /ker euh teuh skohp /, n. Ophthalm. an instrument, as Placido s disk, for determining the symmetry of the curvature of the cornea. [1885 90; KERATO + SCOPE] * * * …   Universalium

  • keratoscope — An instrument marked with lines or circles by means of which the corneal reflex can be observed. SYN: Placido da Costa disk. [kerato + G. skopeo, to examine] * * * ker·a·to·scope ker ət ō .skōp n an instrument for examining the cornea esp. to… …   Medical dictionary

  • keratoscope — n. device which measures the symmetry of the curvature of the corneas (Ophthalmology) …   English contemporary dictionary

  • keratoscope — Placido s disc; n. an instrument for detecting abnormal curvature of the cornea. It consists of a black disc, about 20 cm in diameter, marked with concentric white rings. The examiner looks through a small lens in the centre at the reflection of… …   The new mediacal dictionary

  • keratoscope — noun medical instrument to examine the cornea in order to detect irregularities in its anterior surface • Hypernyms: ↑medical instrument * * * keratoscopy /ker euh tos keuh pee/, n. /ker euh teuh skohp /, n. Ophthalm. an instrument, as Placido s… …   Useful english dictionary

  • Кератоскоп (Keratoscope), Диск Плацидо (Placido'S Disc) — прибор для определения аномальной кривизны роговицы. Он состоит из черного диска диаметром примерно 20 см, на котором нанесены концентрические белые кольца. Врач смотрит через небольшую линзу в центре ксратоскопа на отражение колец, получаемое на …   Медицинские термины

  • Placido disk — keratoscope …   Medical dictionary

  • Placido's disc — keratoscope …   The new mediacal dictionary

  • cheratoscop — CHERATOSCÓP, cheratoscoape, s.n. (med.) Astigmometru. – Din fr. kératoscope. Trimis de valeriu, 13.09.2007. Sursa: DEX 98  cheratoscóp s. n., pl. cheratoscoápe Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic  CHERATOSC//ÓP… …   Dicționar Român

  • Keratoconus — Classification and external resources The conical cornea that is characteristic of keratoconus ICD 10 H …   Wikipedia

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