One eyed chicken?

One of the chickens, our oldest girl Esme, seems to have gone slightly blind in one eye. I noticed she had a swelling a couple of weeks ago and washed her eye with water and anti-septic. The swelling went away, but she appears to have developed a form of cataract. She doesn’t seem to mind, and runs about with the other girls as frantically as ever. She’s still laying too (we’re getting five or six eggs a day from the six girls and I can’t eat much more omlette!)… I don’t think she’d do so if she were unhappy.