This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables.
To the Editor.
—Toy balloons with imprinted figures that make them suitable for use as opticokinetic testing drums are readily available. I have been using them for this purpose for some time and find them very effective. They have the obvious advantage that in the deflated state they occupy only a fraction of the space required by the usual drum and are readily portable. In use they are most easily controlled by sticking a loop of plastic tape to the end opposite the stem to use in rotating the balloon as a drum. A florist "twistem" wire is very handy for sealing the stem while the balloon is inflated for use.
Morrison FD. BALLOON OPTICOKINETIC TEST DRUM. Arch Ophthalmol. 1963;70(4):589. doi:10.1001/archopht.1963.00960050591035