This became the de facto theory for light, known as the Huygens ... Ultimately mostly correct, he proved that lenses refract light to a focal point but that different wavelengths refract differently.

When evolution skeptics want to attack Darwin's theory, they often point to the human ... how could it have created the separate parts of the eye -- the lens, the retina, the pupil, and so forth ...

A research team at POSTECH has developed a novel multidimensional sampling theory to overcome the limitations of flat optics.