hehe now we know what Edwin Hubble put in that eternaly fuming pipe!
re studies of pot on vision, I would refer you/them to studies done on the jamacian night fishermen who for generations have supposedly used the stuff to make a living this way, (there was a 60 min thing on it once, many years ago in the swingin '80s maybe?) it turned out thc increases the amount of visual purple/Rhodopsin produced in the eye/retina, giving you exeptional night vision, almost cat like!
http://en.wikipedia.org/wiki/Rhodopsin
NOTE: Not that that is good reason to mess with a potentially (in around 10% of pop.?) life ruining drug of, in some cases, potential dependence, and not to mention the propensity to get the 'hey man' and total dag i.e. neil from the young ones syndrome ect.
peace