I think I see a pink film over the eye. Can you confirm that? Compare to a normal chick if need be.
This may be a bacterial infection of the eye. Both eyes? I recommend flushing the eyes with saline and using an antibiotic ophthalmic ointment in them such as Neosporin or Terramycin.
If you see swelling and the eyes don't respond to the ointment, then you would best start the chick on Tylan 50 at .25ml twice a day for five days. These can be found at most feed stores.