The brain uses electrical currents and impulses to show us things about the world around us. Why use light as a medium for an electrical impulse? At the simplest level, our eyes simply process light better than the electrical impulses which are generated by the brain in order to create images we can see. We don't have the ability to see electrical impulses in our heads but an eye can easily perceive them and interpret them into images.
Many people have natural vision problems, two of which include presbyopia or age-related farsightedness, meaning they may be nearsighted or farsighted. These people also experience difficulty in vision correction where the conventional lenses used in conventional eyeglasses do not adequately correct and focus on near objects.
Your brain is producing an "incoming sensory signal" of light which is received by a "... your retina, which converts the incoming sensory signal back into an electronic signal using the local optic nerve. The optic nerve is an extension of the brain area that processes and interprets sensory input from the eyes and ears."
Sound waves travel through the air and make a difference in electrical voltage signal which are reflected by the structures of the environment and detected by your ear within a specific frequency window.
When I'm asked how are we supposed to evolve to new levels in our understanding of technology, the leap I make is that we biologically evolve. We evolve by moving from a "survival" life situation to a "higher" one. d2c66b5586