Prevent Blindness America has declared June as Cataract Awareness Month. Cataracts are the leading cause of vision loss in the United States, and it is the leading cause of blindness in the world. There are 24 million Americans over the age of 40 who are affected by cataracts, so it seems fitting that an entire month should be dedicated to education and awareness. Even though cataracts are so prevalent, they are very simple to treat. Cataracts are a leading cause of blindness among older adults in the United States. More than half of all Americans have cataracts by the time they are 80 years old. Cataracts can also sometimes be found in young people or even newborn babies.