Blindness is more feared by the public than any other ailment. Artificial vision for the blind was once the stuff of science fiction. But now, a limited form of artificial vision is a reality. Now we are at the beginning of the end of blindness with this type of technology. In an effort to illuminate the perpetually dark world of the blind, researchers are turning to technology. They are investigating various electronic strategies designed to prevent various defects or missing links along the image processing path of the brain and provide some form of artificial sight.
The artificial vision system is being studied all over the world. There are many types of artificial vision systems that are proposed. The basic concept of the artificial vision system is "The electrical stimulating nerve tissues associated with vision help to transmit electrical signals with visual information to the brain through intact, neutral networks." Many systems are proposed because of their potential for the development of various types of devices with existing technologies. These take into consideration the condition of the patient, the nervous tissues subject to stimulation and their role in the visual network. This review discusses the system being researched and developed these days. These devices mainly use electrodes and tissues directed against the electrical stimulation of the enemies. Fully implantable system with all the functions however is not yet developed with the current technology for any type of system. The systems used today are electrodes implanted in the body, which work with various devices used outside the body.