The feline tapetum reflects light 130X more than the human eye. Larger pupil and larger corneas permit more light to enter the eye. The more posterior location of the feline lens makes for a smaller and brighter retinal image. The nasal extension of the retina, the laterality of the eyes, and the horizontal pupil facilitate tremendous peripheral vision for the horse standing with its head up. The horse utilizes both eyes until an object approaches within 3-4 feet when it is forced to turn its head continue to observe with one eye.
Cones are present in the horse retina suggesting that they have the capacity for color vision.
They may have more trouble with short wavelength colors such as blue, but this is controversial. These owners have designed and are marketing a hoop on a harness that can be used to help blind dogs move around familiar and even unfamiliar environments. Back To Top Copyright information goes here.