I think I would treat the eye as a possible injury and infection..
let us know about the droppings.
feed up with a boost of protein and vitamins.
see how this bird does..
if they continue to show symptoms leading to diagnosis of disease..
poster can opt to cull or treat..with caveat that...
Mike...look for the Tylan in the livestock section..not the poultry section.
also available online from jeffers livestock supply and foys pigeon supply..
http://www.firststatevetsupply.com/
http://www.foyspigeonsupplies.com
http://www.jefferslivestock.com
flush the eye gently with sterile water..see how it looks..
apply the ointment, as Brian suggested, or antibiotic eye drops.(human kind ok, if you have any)
I'd go for the Tylan 200..
it's available in most farm/feed/livestock stores.
if you are unable to get the Tylan 200, there is Tylan...