Why Rose Colored Glasses?

An article about chicken eyeglasses at Ask.com states that "rose-colored lenses as the coloring is thought to prevent a chicken wearing them from recognizing blood on other chickens, which may increase the tendency for abnormal injurious behavior.

What is the purpose of rose colored glasses?

“Rose Colored Glasses”

Yellow tints are popular among hunters; they improve sharpness of vision by filtering out the scattered, out-of-focus blue light from the scene. They also assist in low light conditions and help sharpen the contrast between objects and their backgroud.

Is rose colored glasses a bad thing?

That's simple: wearing rose-colored glasses that radiate all-encompassing, unrealistic positivity is just another word for denial. And denial is decided a bad trait in life in general but in mental illness specifically. It's a bad quality not to be able to see things that really are painful or negative.