Keratometer | Keratometry | Procedure | Types | uses and calibration 

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History of keratometer: Helmholtz referred the process of measuring corneal curvature as ophthalmometry and the device as an ophthalmometer. This terminology is still used today, but as Emsley pointed out, it is confusing because it implies measurement of the whole eye and not just the cornea. For this reason, keratometry and keratometer are the more commonly used terms today, although some manufacturers still use the term ophthalmometer. Although Helmholtz devised a successful experimental device, the first practical keratometer that was suited for clinical use was developed by Javal and Schiötz in 1881. Many improvements have been made to keep the keratometer current with modern ophthalmic standards, but the basic optical design of these instruments has changed very little over the last century. In 1932, the Bausch & Lomb company introduced improved focusing, circular mires for better qualitative assessment of astigmatism, and simultaneous curvature measurement along orthogonal meridians, which significantly improved the ease of use of the keratometer.