Thomas J. Watson Research Ctr. Image processing can reduce this. The technique is effective, but there are costs of course, and some surprises. 1 shows crosstalk, one eye's image seen faintly by the other eye.
Culprits are slow shuttering, leakage through the shutter, and phosphor afterglow.
Rules of thumb help reduce crosstalk. That reduces the double images that give rise to the stereo sensation. Smaller double images mean less crosstalk. Color selection helps too. White lines on a blue background produce little crosstalk.