They get pecked in the eye sometimes, and we have had a lot of chickens with this condition. I take a wet washcloth, and gently wipe everything off the outer part of the eye, like crust and bubbles, bubbles are normal. The eye should heal itself. We had a hen with her eye closed for a month, and one day it was open.
1 Buff Orpington Roo, 1 Rhode Island Red Roo, 3 Rhode Island Red Hens, 3 Red Sex Link Hens, 1 Welsummer Hen, 2 Unknown Crossbreed Chicks, 13 Incubating Eggs