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UMD: Ophthalmic diagnostic instruments designed for examining the angle of the anterior chamber of the eye using a plastic cone-shaped contact lens. Gonioscopes usually consist of a three- or four-mirror contact lens (indirect gonioscopes) or mirror-less contact lens (direct gonioscopes), through which the light projecting from the anterior chamber angle structures passes, and a slit-lamp microscope or handheld microscope, and an illumination source to obtain a magnified image of the anterior chamber. Gonioscopes that use light reflected from the contact lens mirror (i.e., indirect gonioscopes) and those that do not use reflected light (i.e., direct gonioscopes) for examination of the anterior chamber of the eye are available; they are used mainly in the diagnosis, monitoring, and treatment of glaucoma.
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