Keratometer
Keratometer
Keratometer (pronunciation: /kɛrəˈtɒmɪtər/), also known as an ophthalmometer, is a diagnostic instrument used by ophthalmologists and optometrists to measure the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the French ophthalmologist Louis Émile Javal in the 19th century.
Etymology
The term "Keratometer" is derived from the Greek words 'kerato', meaning cornea, and 'meter', meaning to measure. Thus, the term literally translates to "cornea measurer".
Function
The Keratometer shines a light onto the cornea and measures its reflection, giving an indication of the cornea's curvature. This information is crucial in diagnosing and managing corneal conditions, fitting contact lenses, and preparing for refractive surgeries such as LASIK.
Types
There are two main types of Keratometers: Javal-Schiotz Keratometer and Automated Keratometer. The Javal-Schiotz Keratometer is a manual device that requires significant skill to operate, while the Automated Keratometer is a digital device that can provide readings more quickly and easily.
Related Terms
- Ophthalmology: The branch of medicine that deals with the diagnosis and treatment of eye disorders.
- Optometry: The practice or profession of examining the eyes for visual defects and prescribing corrective lenses.
- Astigmatism: A common, mild and generally easily treatable imperfection in the curvature of your eye.
- LASIK: A type of refractive eye surgery.
- Javal-Schiotz Keratometer: A type of manual keratometer named after its inventors.
External links
- Medical encyclopedia article on Keratometer
- Wikipedia's article - Keratometer
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