[GHILLIE MAN]

Hi, Ive noticed there's several different color lenses for shooting glasses.
What is the significance of the different colors? I see some guys shooting long range rifles with clear lenses, then switch to yellow lenses for handgun shooting? Is there a reason for that? Ive heard that the yellow removes part of the blue spectrum that can affect shots when not using a scope? a myth?

Any info would be of help.

Thanks.