What is an animal’s Arc of Vision?
An Arc of Vision (AoV) is also known as the Field of View (FoV) or the Field of Vision (FoV) or the Visual Field.
It is the view that an animal can see when its head, and the eye, are still. Can it see all around it – on all sides – or can it only see what is in front of it?
Monocular vision is what can be seen with one eye, and binocular vision is what can be seen with two eyes.
Central vision is the object that is seen clearly in front of you. Peripheral vision is the view around the central vision, which you can see, but not in good detail.
For example, humans cannot see behind them, and they cannot see what is above them, without moving their head. The blind spot, or the blind area, is the view that you cannot see at all without moving your head.
Humans have a maximum Arc of Vision of about 100-120 degrees (100-120o) in front of them (horizontal vision), and a 50-70 degrees (50-70o) Arc of Vison up and down (vertical vision). This is because humans have eyes close together in the front of their head.
Animals like dogs and cats, and most mammals, have an Arc of Vision that is similar to a human’s AoV.
But some animals have eyes on the sides of their head, far apart, and some animals have eyes at the top of their head. This means that their Arc of Vision is different from a human’s AoV.
Chameleon lizards have eyeballs that rotate. This means that they have an Arc of Vision that is 360 degrees – a full circle all around them – left and right and up and down. This is the widest and maximum AoV.
Photographer: Martina Nicolls
Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM