It has been 5 days since Roxy stopped taking the niacin. I keep testing her daily to see if her sight changes. Her vision seems to be slowly returning to normal, only 1/4 blind. She responds to sit, down and back up hand signals if the lighting is right. Not to bright, not to dark appears to get the best results. I thought I might hear from the vet regarding Roxy's condition but I guess I shouldn't hold my breath. She still won't go down the basement stairs by herself but I did find her sleeping in the cage this morning. A first in a very long time.