Age-related macular degeneration is the leading cause of blindness in older adults, yet researchers are still in the dark about many of the factors that cause this incurable disease. But new insight from University of Florida (UF) and German researchers about a genetic link between rhesus monkeys with macular degeneration and humans could unlock secrets about the earliest stages of the disease, when severe vision loss could still be stopped.The researchers pinpointed a chromosome region and genetic markers for macular degeneration in humans and rhesus monkeys