If someone is "
seeing the
world through
rose-
tinted
glasses," it means that they always
look on the bright side of life and are generally
happy people. These are your
friendly,
cheery folks that sometimes you just can't not like. They seem to
radiate something
beautiful at all times.
The etymology of the phrase is somewhat strange. During the mid-1800's, glasses with colored lenses were used to treat various diseases and illnesses. For example, blue lens were for insanity, yellow ones were for treating syphilis, and pink was used to cure depression. Supposedly, looking through the pink lenses made you happier. I believe it. Damn, if someone gave me rose-tinted glasses when I was feeling sad, I'd cheer right up. But I'm weird like that.