How long does it take for your cornea to heal?

Corneal abrasion: If you have scratched your cornea (creating a "corneal abrasion"), your cornea often heals within 24-72 hours. Healing time may be longer, however, if the abrasion is deep, irregular or becomes infected. It is a good idea to have a scratched cornea evaluated by a physician.

About 1-4 days: It depends on the size of the scratch. Uncomplicated small scratches or abrasions can heal in 24 hours. The entire corneal surface can heal in 3-4 days. If there is infection, chemical burn, or other significant disease, though, all bets are off.