I did a search to see if anyone had posted on this, and if so, please forgive me, but I saw an ad for glasses that filter out all green light, and allow the person wearing them to "see" grass stress, diseases, drought stress, etc. on a lawn.

Has anyone heard of these or used them?

I won't post a link, for fear of sounding like i'm trying to sell something, but they can be easily found, if anyone wants to take a look at them online.

They sound good in theory. Anyone know about them?

I posted this on the regular lawn care board as well.