Liberal theory tends to use double images of human beings. (religion-online.org)
But 43 percent of people in the Naval group, and 46 percent in the civilian group, reported visual symptoms — such as double images, glare, halos, and starbursts — after surgery that they hadn't reported before. (health.com)
It gives the crystal calcite its famous ability to produce double images of objects. (sciencemag.org)