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Gonioscopes designed for directly examining the angle of the anterior chamber of the eye using a mirrorless, plastic, cone-shaped contact lens (without light refracting from mirrors). Direct gonioscopes usually consist of a mirrorless contact lens through which the light projecting from the anterior chamber angle structures passes, a handheld microscope, and an illumination source to obtain a magnified image of the anterior chamber. Gonioscopes are used mainly in the diagnosis, monitoring, and treatment of glaucoma.
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