Walking on the grass is good for eyesight

That is something I didn't know: walking on the grass is (supposedly) good for your eyesight. An indian friend just told me this.

I, of course, immediately went to Google to try to find evidence of this. In a quick glimpse, the two links I found are related, I think, to popular belief. They are not from a trustworthy or scientific source. One is a Yahoo Answers reply and another, which is quoted below (my emphasis), comes from the site tips4me.com.

So what do you think? Is this something already known around and I was the only one who didn't? Being true or not, this can be a good excuse for walking on the grass where you are not allowed to...

WALKING BAREFOOT IS GOOD THERAPY
Shoes trap energy around the feet, and that could be one of the reasons for feeling tired at the end of a long day. So take them off whenever you can and give them as much air as possible. Barefoot walks help tone the muscles of your feet, keeping them young and strong. An early morning barefoot walk on cool, dewy grass is refreshing and invigorating for the entire system, not just your feet. It is also believed to have a very good effect in improving eyesight. Do walk barefoot as much as possible to help the bone structure of your feet function according to its natural shape.