Two month''s chicken closing one eye.....

[kashifpakistani]

Hello BYC,
I have 4 buff cochin chicks, In fact here summer weather is going on and I changed the cage to keep them cool. During this they were jumping and cackling. Further I noticed that one of them is closing one eye, he is eating, drinking and pooping well but am worry about his behavior. Is this symptoms of disease or his eye hurt due to changing cage?
Please............ help.

 

[Eggcessive]

Is there any drainage or crust around the eye? Does your chick sneeze or gasp for air? Do you see any marks where it could have been pecked?