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Hertel exophthalmometers take a measurement from the lateral orbital rim to the corneal apex. If a patient presents with an orbital fracture or after lateral orbitotomy, the use of a Hertel exophthalmometer may be complicated because the lateral orbital rim serves as a reference point for this instrument.
Hertel exophthalmometer: A system of mirrors or prisms that projects a lateral view of the eye against a ruler that measures the distance from the lateral canthus to the anterior surface of the cornea: To evaluate the prominence of the eye, which increases in hyperthyroidism [14] [15] Luedde exophthalmometer
After the First World War, Hertel moved to Berlin before leaving for the University of Leipzig in 1920, where he remained until his retirement in 1935. Hertel invented the Hertel exophthalmometer, a method of measuring eye displacement. With his colleague, Jakob Stilling, he developed the Stilling-Hertel test for colour vision deficiency.
Measurement of the degree of exophthalmos is performed using an exophthalmometer. Most sources define exophthalmos/proptosis as a protrusion of the globe greater than 18 mm. [1] The term exophthalmos is often used when describing proptosis associated with Graves' disease. [4]
to break disposable blade after use to prevent reuse Thermo-cautery: to coagulate blood vessels and prevent haemorrhage: Cryoprobe: to freeze and extract the lens Yttrium aluminium garnet laser (YAG laser)
Hertel & Reuss was a manufacturer of optical instruments based in Kassel, Germany, which emerged around 1995 following the bankruptcy of its predecessor company (founded in 1927 by Otto Hertel and Eduard Reuss.) The owners of Hertel & Reuss KG were Herr Eduard Reuss and his two sons Herr Gerhard Reuss and Herr Helmut Reuss.
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Around 1910, binocularity was tested using trial frames which sat on the patient's face or on a support bar, with extra testing devices added to the front of the frames, such as Maddox rods, rotating prisms, and phorometers. The refraction part of the exam was done with trial lenses that fit into the back of the same trial frame.