To the Editor.
—Laser energy may be reflected back into the eyes of the treating ophthalmologist secondary to the filters falling off the shutter mechanism. During the last 2 years at our institution, two incidents have occurred in which the protective filters mounted onto the shutter of our argon/krypton laser fell off the shutter during treatment (Figure).A laser (Model 41AK) was purchased by our institution in June 1982 and was involved in both instances. On our laser, the filter for each eye is individually glued onto the shutter. Apparently, the glue did not maintain its bond over time, and one of the filters fell off the shutter. If the filters are mounted onto the shutter with glue only and not reinforced by some other mechanical means, the risk of the filters dislodging appears to be increased. An incident somewhat similar to ours has been reported with a Coherent Radiation
Allinson RW, Thall EH, Stanko M. Risk to the Treating Ophthalmologist When Using the Laser. Arch Ophthalmol. 1991;109(8):1057–1058. doi:10.1001/archopht.1991.01080080015004
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