Computer Glasses only block the high-energy blue and violet light (which disrupts mood and sleep cycles) emitted from screens. That's to say, they don't make your eyes better; they don't change the type or quantity of light reaching your eyes, and cannot be used outside. It's important to get good eyeglasses for general viewing: like safety goggles when working with machinery, reading glasses for close work, etc.
"Computers can produce higher-than-normal amounts of ultraviolet radiation that may affect your skin’s complexion." Also looking at screens too long can be tough on the eyes. So if you're looking for computer glasses, I recommend taking a screen break after 3 hours...