Corneal topography
Corneal Topography
Corneal topography, also known as photokeratoscopy or videokeratography, is a non-invasive medical imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye.
Pronunciation
Corneal: /kɔːrˈniːəl/ Topography: /təˈpɒɡrəfi/
Etymology
The term "corneal" is derived from the Latin word 'corneus', meaning 'horny', due to the cornea's tough, protective nature. "Topography" originates from the Greek words 'topos' meaning 'place' and 'graphia' meaning 'writing', indicating the practice of creating detailed maps or descriptions of a place.
Procedure
Corneal topography involves the use of a special device that projects a series of light rings onto the cornea. The reflections of these rings are captured and used to generate a detailed map of the cornea's surface. This map can help identify irregularities in the cornea's shape and curvature, which can be indicative of conditions such as keratoconus, astigmatism, or corneal distortion.
Related Terms
- Keratometer: An instrument used to measure the curvature of the anterior surface of the cornea.
- Placido disc: A disc used in corneal topography to project rings of light onto the cornea.
- Corneal ectasia: A condition characterized by progressive thinning and weakening of the cornea, leading to its bulging outward.
- Refractive surgery: A type of eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses.
See Also
External links
- Medical encyclopedia article on Corneal topography
- Wikipedia's article - Corneal topography
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