Eye doctors use Avastin to treat several eye and retina diseases, like age-related macular degeneration (AMD). AMD is the leading cause of blindness in people over 50 years of age in the United States. AMD is caused by the breakdown of the central portion of the retina, called the macula (the highly sensitive part of your eye that works like the film in a camera). Click here to watch an. Looking to maintain a healthier lifestyle? Get useful information and tips on health, diet & nutrition, fitness, recreation and more.