Estimates of the cost of invasive species to the United States alone are in the tens of billions of dollars yearly. Annual federal expenditures on prevention and management of invasive species are estimated to exceed $1.3 billion.
Depending on what specific conditions are. Some of the color we see when we close our eyes is light that gets thru the eye lid. It usually has a red componenet to it because of the blood veins. Sone, especially right after closing our eyes is the various elements in our visual system settling down (rods, cones, ...).
The cold will reduce swelling and pain. The color from a black eye is a result of blood pooling under the skin, and the cold will constrict your blood vessels, which may lessen or slow the bleeding. Use gentle pressure to press a bag of crushed ice, frozen vegetables, or an ice or old pack to your eye.