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  • Ophthalmic measuring instruments designed for objectively determining the curvature of the anterior corneal surface and refractive error (astigmatism) by projecting concentric rings on the cornea. These devices typically consist of a circular disk with a series of concentric rings (also known as Placido\'s disk) whose images are projected onto the cornea. The reflected images of the rings are viewed by the examiner and/or are recorded using a video camera (videokeratoscope) or a still film camera (photokeratoscope) for later examination. Keratoscopes are used mainly for preassessment for refractive corneal surgery, contact lens fitting, or diagnosis of some corneal disorders.
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