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It's a vision therapy thing. The disc is actually a pegboard, and it has various overlapping geometric shapes drawn along the holes. The user (i.e. Minifobette) sits close to it and outlines shapes with pegs one at a time while it spins. I've tried it myself and it's a fairly intense hand-eye coordination effort, depending on how fast it's spinning, and of course it's important to change up the speed and direction occasionally to keep the workout going.
Of all the exercises she's been doing at home and in the office, this machine is by far her favorite, and it's been getting the best results as far as increased tracking control with her eyes. But of course the therapeutic one is patented and costs $600. Ridiculous. I feel sure I could make one for home use for less than $50, and the optometrist's office has even hinted that if I do make a working one, they'll buy it off me after Minifobette doesn't need it anymore.
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