Many animal lovers would do just about anything for their dog or cat -- even buy their precious pet eyeglasses or sunglasses.
That kind of sentiment has fueled the creation of Doggles, prescription glasses for pets, Denver television station KMGH reported.
If you ever wonder what your dog really sees, rest assured that they do see in color, albeit muted tones.
"And typically, it's yellows and blues, whereas people have trichromatic vision, we can perceive the entire visual spectrum," said Dr. Steve Dugan, a veterinarian ophthalmologist.
But how can you tell if your dog is having trouble seeing?
Putting a dog through a makeshift maze is just one of the ways Dugan can test a dog's eyesight.
Prescription glasses for pets.