Why is my chicken going blind?

[PixieChick19]

I recently noticed that my blue wyandotte hen's left eye started showing signs of blindness. When you look at the eye at an angle you can see a white substance behind the iris in the back of the eyeball. She also has just started forming little white dots in the center of both her eyes. She turns her head sideways to see where she is going and she has had a history of infections in that eye. I tried eye drops meant for humans and they seemed to work. However, the last time I used the eye drops was a long time ago and she is just starting to give signs that she is going blind. Is it because of her age, the infections, or the eye drops that she has become visually impaired? Is there a way to treat it?

 

[holly1001]

Could you take it to the vet?

 

[Eggcessive]

Pictures can sometimes help. It sounds like she has lost her sight from the infections in the past. Cataracts are also common in chickens. Certain conditions such as avian encephalomylitis as a chick, can lead to blindness later on in life. Here is a good link or two to read about eye problems:
http://edis.ifas.ufl.edu/ps031
http://www.joneshamiltonag.com/jh/wp-content/uploads/2011/10/PLT_Poultry-Eye-Disorders.pdf