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The use of the contact lens for gonioscopy is often attended with considerable difficulty in expelling the air bubble from the hollow of the glass. The maneuver of lifting the rim causes discomfort to the patient, and there is a tendency for the liquid to flow over the face and nose. The surface of the glass becomes soiled by the operator's fingers.
To be able to fill the contact glass with fluid while the glass remains in position over the patient's eye would be a distinct advantage. To this end I caused a narrow channel to be drilled through the center of the glass and another about 2 mm. away ; both these holes communicate with the cavity of the glass, which is above the cornea. A hypodermic needle of proper bore which has been shortened to correspond with the thickness of the glass and blunted is introduced into the eccentric
Friedman B. AN IMPROVEMENT IN THE GONIOSCOPE CONTACT GLASS TO FACILITATE FILLING WITH FLUID. Arch Ophthalmol. 1941;25(3):510. doi:10.1001/archopht.1941.00870090134015
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