Gooey eye chick
It's hard to tell by the picture.
Is the eye swollen, have clear liquid, yellow pus?
Any signs of coughing, sneezing, runny nose, discharge?
Do you know what caused the eye to be that way?
I would separate the chick, keep it warm and on clean bedding, with feed and water.
Flush the eye with saline and see if there is anything in it, such as dust, feed, or see if it has been pecked or injured somehowe. If it has pus in it, take a qtip wet with saline and remove as much pus as possible. You can apply some Vetericyn eye gel or Terramycin eye ointment in the eye.