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Doing glaucoma testing on patients can be a true bottleneck when you’re doing the bowl perimetry,” says Brian Shafer, MD, Shafer Vision Institute, Philadelphia PA, “because you need an actual technician dedicated to standing there, performing the test on the patient through the entirety of it.” What’s more, the large, awkward, confining bowl perimetry machine is off-putting for many patients, especially those with mobility issues.