Medieval scholars were particularly fascinated by the science of optics and invented eye glasses partly as a result of their studies using lenses to determine the nature of light and the physics of sight.

FORBES: Connect

The sun had dropped behind the bluffs already, so that the tops of the bare trees showed up finely spiky, like hair or fur, against a yellow glow of light from somewhere out of sight.

NEWYORKER: Friendly Fire

Perot's eyes light up at the sight of yellow school buses in front of Houston's Museum of Natural Science.

WSJ: How Dallas Does Philanthropy: Perot Museum of Nature and Science

The galactic centre can only be observed at certain wavelengths - such as X-rays - because large amounts of dust lie in our line of sight, blocking out optical light.

BBC: Arches Cluster, Leicester

The sight of small white figures endlessly regrouping, wandering about, pondering the light, all seen from one fixed angle, made poor spectator sport and even worse television.

ECONOMIST: Kerry Packer

It may bring to light some cases in which accusations were kept under wraps and the accused were kept out of the sight of the law or accusers.

CNN: STORY HIGHLIGHTS