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It's a problem that has plagued photography since
its creation: soft edges. No matter how high-quality the camera, math
has dictated that the curve of optical lenses would always be slightly
softer than the center. At least, that was the problem until Rafael G. González-Acuña, a doctoral student at Mexico’s Tecnológico de Monterrey, up and solved it.
The problem goes back thousands of years to the Greek mathematician Diocles. A (far less famous) contemporary of Aristotle, Diocles wrote a book titled Burning Mirrors. In that book, Diocles described what would become known as a "spherical aberration."...
But Héctor A. Chaparro-Romo, a doctoral student at the National Autonomous University of Mexico
(UNAM), had a feeling that the problem could be solved. So he began
working on a solution three years ago, and eventually invited
González-Acuña to solve it with him.
Source: Popular Mechanics
