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October 1968


Author Affiliations

Palo Alto, Calif

Arch Ophthalmol. 1968;80(4):532-533. doi:10.1001/archopht.1968.00980050534030

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To the Editor.  —The use of electrical equipment has increased markedly in the last few years, and ophthalmologists should demand safety in their equipment. Most household appliances such as electrical motors and drills come equipped with threewire cords and the frame of the instrument can be grounded. Furthermore, most building codes in modern cities demand that all commercial office outlets be grounded. Yet, a variety of our equipment comes without such grounding.For example, certain projectors come equipped with a conventional 110 volt plug without grounding. A current leak can exist between the wiring in this instrument and the frame of the instrument. Motorized chairs come equipped with grounded plug and the chair itself will be grounded. Likewise, the refracting stand and the refractor may be grounded.The hazard is an obvious one. The ophthalmologist reaches for the projector with one hand and the refractor with the other. If

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