Eye beam

For other uses, see Eyebeam.

In Platonic physics and the emission theory of sight, an eye beam was thought to be a beam or particle of energy generated in the human eye, which then emitted outward to produce the experience of sight.

The concept originated in the writings of Plato, but were rejected by Aristotle. Aristotle understood sight correctly, as depending on externally intromitted light The exaggerated eyes of busts of fourth-century Roman emperors like Constantine the Great reflect this character.

The emission theory seemed to be corroborated by geometry and was reinforced by Robert Grosseteste.

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