A device that maintains steady fixation while plotting the visual fieldof an eye with a large central defect is presented. The device is composedof multiple adjacent pinhole tubes mounted on an eye shield and placed infront of the seeing fellow eye. The device constricts the visual field ofthe fixating nontested eye to preserve only the central 3°, thus not interferingwith the visual field of the tested eye. We tested 3 healthy volunteers withsimulated visual field defects and more than 100 patients with unilateralloss of central vision. The use of this device allowed us to plot visual fielddefects with clear-cut borders while no meaningful results could be obtainedwithout it. We found this device to be efficient, simple to use, and suitablefor all varieties of perimetry.
Almog Y, Shiftan A. Plotting Visual Fields Using Contralateral FixationA Novel Honeycomb Device. Arch Ophthalmol. 2004;122(7):1052-1056. doi:10.1001/archopht.122.7.1052