My friend used these on his doberman who was albino, so he was blind in sunlight. Since he couldn't see outside he growled at every noise until he heard a voice he recognized. They were just tinted enough that he could see really well and knew who was near him and was able to get around better. We ended up getting a different brand later on because they didn't stay on as well, but that was only because this dog was so petite in his frame and he just needed a much smaller size. Overall they worked really well for this purpose though.