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.

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