Depth perception is the ability to perceive the world in three dimensions and to judge the distance of objects from oneself. It is a crucial skill for everyday activities such as driving, playing sports, and navigating through the world.
There are a number of ways to check depth perception. One common method is the pencil test. To perform the pencil test, hold a pencil at arm’s length and focus on the tip. Slowly bring the pencil closer to your face, keeping your focus on the tip. If you have normal depth perception, the pencil will appear to move in and out of the background as you move it closer to your face. Another way to check depth perception is to use a stereoscopic image. A stereoscopic image is a pair of images that are slightly offset from each other. When viewed through a stereoscope, the images will appear to merge into a single three-dimensional image. If you have normal depth perception, you will be able to see the three-dimensional image clearly.