[Fauntleroy]

I'm not sure this works if you have astigmatism

[EvanAnderson]

Having similar acuity in both eyes made a huge difference for me. I'm somewhat astigmatic but was able to do this eye "uncrossing" trick just fine. I had a significant loss of acuity in one eye and that's what left me unable to do this (or to watch 3D movies).

[ehayes]

I have a small astigmatism (and wear glasses) and I was able to do it, but I feel like if I did any more today I'd have a headache.

[mikepurvis]

I did until it was corrected with LASIK a year ago, and I could still do magic eyes, both with and and without my glasses on.