Some of us may remember playing the game "I Spy," with my little eye, where the speaker would describe something within everyone's line of sight for the other participants to guess what they see. In a world of smartphones, tablets and other handheld devices, our eyes can see the whole world right from our fingertips.
The eye is a truly amazing organ which turns light into sight and for animals, this can mean a completely different type of vision. For example, insects and arthropods, have compound eyes that can have up to 25,000 lenses compared to the single one found in humans. This allows for thousands of images being present at once, which allows faster motion detection and image recognition, which is the reason why it can be difficult to swat a passing fly.
People and most other animals, have eyes that are similar to a camera, which use a single lens to focus images onto a light sensitive membrane on the inside of the eyeball called the retina. While these camera-type eyes are similar conceptually, most animals see the world completely different than humans.