1.To reduce swelling around the eye, apply ice or cold packs for 15 minutes 3 or 4 times a day during the first 48 hours after the injury. The sooner you apply a cold pack, the less swelling you are likely to have. Place a cloth between the ice and your skin. After the swelling goes down, warm compresses may help relieve pain.
2.Do not use chemical cooling packs on or near the eye. If the pack leaks, the chemicals could cause more eye damage. Do not use a piece of raw meat on an injured eye.
3.Keep your head elevated to help reduce swelling.
Source: http://www.everydayhealth.com/health-center/eye-injuries-home-treatment.aspx