Treating Snow Blindness**
You can treat snow blindness in the field, but it requires time. The treatment is to rest for 18 to 24 hours with one's eyes closed. Bandage the patient's eyes to keep them from looking around, and administer pain medicine as needed. In the end, the eyes will heal themselves.
Preventing Snow Blindness**
Snow blindness is easily prevented by wearing UV-protective sunglasses. It's not a bad idea to stock your winter survival kit with a pair of polarized sunglasses, as well as sun block for the other exposed areas of your face. If you find yourself in a situation without UV-protective sunglasses, you can make snow goggles as the native folks of the arctic have done for centuries by cutting slits into a rectangular strip of cloth, leather, or plastic. Some traditional Inuit snow goggles were made from walrus tusk ivory or animal bones such as wide rib bones. You can also craft the slotted eyewear from wood or bark, and use cord to keep it on your face. Whichever material you choose to fashion your goggles from, cut a ⅛- or 3/16-inch-wide slit about 5 inches in length. This slit will greatly reduce the amount of glare that strikes your eyes and limit the amount of damage your eyes sustain.