One of my ducks a khaki campbell 'Cocoa' is around 3 three years old. She has gone blind in one eye - I didn't notice she'd hurt herself or anything just a white film like she has a cateract. Is there anything I can do and does anyone know if there's a possibility it will go into her other eye? Her other eye is clear at the moment. She's my cleverest duck and rushes to the glass doors if any preditors are around to tell us I would hate to lose her to a preditor as she's saved many lives of our chickens.