Just wondering.., Rose-tinted glasses?

...sparked by a conversation last night, I've been idly trying to track down the source of the phrase.

Wikipedia is uncharacteristically unhelpful on this (redirect to optimism) - however, a few websites seem to state that it goes back to Victorian times and colour therapy, when patients suffering from depression would be given glasses with pink lenses...?

Not sure how reliable that is, though. Do any of you happen to know any more about it?