Losing Your Sight Millions of people cannot fully use their senses and enjoy life. Since humans depend on their sight for 80 percent of their information, losing the ability to see can forever change a person's life. Yet many people have greatly reduced vision, even though they are not completely blind. In the United States, 6 million people are either blind or suffer from diseases to the retina. Luckily, a new procedure using cutting edge technology is giving some people hope. Scientists implant tiny electrical chips into a damaged eye.