Researchers studied three species of Fusarium fungus that cause serious eye infections. They found that one species (F. keratoplasticum) is much more dangerous than the others, invading deeper into the eye and causing more damage. Using a new 3D model that mimics the structure of the human cornea, they discovered that Fusarium fungi penetrate much deeper than other fungal pathogens, which helps explain why eye infections from these fungi are so difficult to treat and why patients often lose their vision.