Vision distorter
Try to throw the ball into the hole when you have the lens in front of your eyes. You may start to get the hang of it after a while: why do you think this is so?
The experiment is all about how the position of our eyes determines what we see. Our vision depends on the location of the eye in the head.
Birds usually have their eyes on the sides of the head, which gives them a good, wide visual field allowing them to quickly perceive dangers that not only come from the front. The horizontal visual field of a woodcock is 360 degrees horizontally to the sides and 180 degrees vertically. This means that a woodcock has a visual field that allows them to see what is happening all the way around them and directly above them.
The eyes of a predator are normally close together and face forward. This allows them to focus with both eyes on one object, providing higher detail vision. It also increases their capacity to judge distances. Some predators have vertical pupils, such as cats. This allows them to hunt both during the day and night.
Prey need to be able to see hazards approaching so they can escape quickly, and they therefore have eyes on the sides of the head. A cow has a 180-degree visual field to the sides. Each eye can see a different view. As such, they are able to see a predator approaching diagonally from behind and at the same time see which direction is best for escape. They have a blind spot directly behind them and can see directly forwards where the two lateral visual fields overlap. Some herbivores, such as goats, have horizontal pupils so they can detect predators out of the corner of their eyes.