I posted a pic of my hen that has a bubbly eye, well both but one is barely noticible. This is the second time I noticed this, but it clears up the next day and no other symptoms. Is there ANYTHING else besides CRD that will cause the bubbly eye??? No new chickens, nothing different, she has been here 2 years(hatched here), others are all healthy, no chickens nearby....I am at a loss 
		
		
	
	
		
	  I just need to know what else could cause a bubbly eye so I can rule it out...thanks