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Definition : Ophthalmic measuring instruments designed to determine the amount of abnormal protrusion of the eyeball (i.e., exophthalmos) by measuring the distance between the lateral orbital rim and the apex of the cornea. The instruments may consist of arc supports integrated with mirrors or prisms, including scales that are positioned against the lateral orbital walls, and footplates with scales that are positioned against the lateral orbital rims; other devices are clear plastic rulers with scales that permit the observation of the corneal apex against the scales. Exophthalmometers are used mainly to assess the extent of exophthalmos.

Entry Terms : "Eyeball Protrusion Measuring Instruments" , "Ophthalmic Measuring Instruments" , "Measuring Instruments, Ophthalmic"

UMDC code : 16345

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