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The inconvenience of glasses soiled with pus or with blood is an experience with which most surgeons are familiar. In some fields, notably bronchoscopy, glasses are an absolute necessity as a protection to the eyes of the surgeon, entirely apart from their value in the correction of visual defects.
Negus conceived the idea of protecting the face with a large glass disk which could be rotated on a central spindle attached to a head-band. The glasses here-with described are a modification of this device. They allow the use of the individual prescription. At the same time they protect the eyes and offer an almost unlimited reserve of clear visual fields, obtained by the same simple maneuver of rotating a glass disk. They consist of an ordinary frame into which lenses may be fitted. A hole is drilled through the bridge between the lens and the
LLOYD MS. BRONCHOSCOPIC OR SURGICAL GLASSES. Arch Otolaryngol. 1933;18(2):201. doi:10.1001/archotol.1933.03580060215009
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