As you know Penny, Tia had a horrid painful eye when I got her at almost 8 years old.
We did our best for the eye, but it was too damaged, and had to go.
Tia immediately became a happy dog, and we thought she was pretty happy before. She's never looked back (sorry for the pun!). Her coat became glossy, she started to run and play, and still copes perfectly without the eye.
I don't really notice to be honest, as of course she always looks at me with her remaining eye, and so that's the side of her face I always see. As dogs live in the here and now, and don't spend loads of time at the mirror, I don't suppose Tia realises she ever had two eyes!!