I'm by no means an expert, but I had this issue with my bantam chicks, it affected one of her eye lids. I rinsed with an eye flush 3 times a day and lightly covered with Neosporin (without pain reliever) even though she would wipe it right off.
She held hers closed pretty close to a week, she did lose vision in her eye and it took a little while for her to gain her confidence back and went to the bottom of the pecking order, but with her one bad eye she is still doing well and thriving. She's just more cautious.
But also because she has a bad lid, it'll look dry and off some days so I still give it a flush out to give a little extra needed moisture.
Best of luck with your chick.