About 70% of all sense receptors in the human body are located in the eyes, which explains why we shape our understanding so much through visual input.
Light enters through an eye’s pupil and the lense which projects the light onto the retina (in the back of the eye).
The retina of the human eye is comprised of two types of receptors. There are rod receptors and cone receptors. The rod receptors sense light and dark light and the information they sense is recorded in black and white.
The cone receptors on the other hand come in three different flavors (one for red with the highest wave length frequency, one for green with an ability to detect light from medium frequency waves, and blue with the ability to detect low frequency waves of light). The three different types of cones are the input sensors which we need to experience color.
The cone cells are focused in the center of the retina, and form an area which we call fovea. About 50% of the optic nerve fibre are connected between the fovea and the human brain, and information is transmitted through it. Because the fovea is central and we move our eyes, the cones are mainly responsible for seeing an object with highest clarity and sharpness. The rods on the other hand are located more on the periphery of the retina and are seen with less clarity.
Because we have a fovea in the center and the rods in the periphery where visual perception is not as sharp, humans move their eyes in saccades. These rapid eye movements make it possible for humans to consume, interpret, and analyze vast amounts of data quickly. A dashboard can hence be understood quickly with data that is related and designed in such a way that makes the relationship apparent.