Hi there,
My little black Cocker (Margot 20 months) also has very poor vision. I got her a great little rubber ball from PAH (as the previous person suggested with a small bell inside). She bounces in time with the sound of the bell which is hysterical to watch!

She very often goes in COMPLETELY the wrong direction and will run around with her nose to the ground, her little bum wiggling like crazy and she will always find it!
I also ask her to 'stay' and then go and hide either the ball or another toy (which I've let her have a good sniff at first). Again, she always finds it.
I was so upset when I found out she had eye problems but it's amazing to see how they cope.
Have fun!
Nancy and Margot xx