Overturns the ancient theory that vision works by rays emitted from the eye, arguing instead that sight occurs when light from external sources enters the eye — built on controlled experiments with mirrors, lenses, and a camera obscura, and widely credited as an ancestor of the modern experimental method.
We find that vision is not achieved except by means of light... and that the qualities of light and color are perceived by the sense of sight only through the arrival of the forms of light and color at the surface of the eye.
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