Cataracts are the most common cause of blindness in humans and account for half of blindness cases worldwide. Currently the only available treatment for the debilitating growths is surgery. It remains prohibitively costly. An eye drop tested on dogs suggests that cataracts could one day be cured without surgery. The study revealed that a naturally-occurring molecule called lanosterol, administered with an eye dropper, shrank canine cataracts. The study is found in Nature.

