I remember Aaron Swartz telling me about his interest in eye exercises for myopia (not just presbyopia).

http://www.aaronsw.com/weblog/001083

I'm pretty sure there's another blog post of his that goes further into the substance than this one, but I didn't immediately find it. (Other references, including one I wrote a few years ago, suggest he once thought the mechanism by which it could help had to do with oxygen levels rather than muscle development.) Does anyone know if this has been supported by clinical research?