Looks like pus in the eye.
Does he have any other symptoms like coughing, sneezing, mucous from the nostrils, what's the inside of his beak look like?
How long have you had him?
General care would be to flush the eye with saline, press out/remove the pus and apply an eye ointment like Terramycin or some use plain Neosporin. Do this 2-3 times a day.