To the Editor.
—We were surprised to read the article by Landers et al1 from the University of California, Davis (Sacramento) describing a "new," inexpensive pump for vitreoretinal surgery in the January issue of the Archives. The instrument, which they termed the "Davis Ocular Air Pump," is identical to the system we designed and published nearly two years earlier in a peer-reviewed journal along with two other useful adjuncts for vitreoretinal surgery.2 We also had determined the need for a less costly alternative to the "current state-of-the-art air pump." Our apparatus was described as a simple, inexpensive, pressure-regulated air pump for fluid-air exchange during pars plana vitrectomy. This unit was assembled using an aquarium-style air pump, a needle-pressure relief valve available for aquarium pumps, a mercury manometer borrowed from a sphygmomanometer, and a two-port aquarium valve connected to disposable tubing and a micropore filter (Figure). Our device has been
Gross JG, Freeman WR, Goldbaum MH, Mendez TL. An Inexpensive, Pressure-Regulated Air Pump for Fluid-Air Exchange During Pars Plana Vitrectomy. Arch Ophthalmol. 1991;109(11):1492. doi:10.1001/archopht.1991.01080110026007