Diagrams of how an image is displayed with a normal eye (top image), myopic or nearsighted eye (middle image), and a hypermetropic or far-sighted eye. In a human, the retina “sees” an image upside down and the brain rights the image.
Keywordseye, eye diagram, myopia, nearsighted eye, far-sighted eye, normal eye, how does an eye view an image, hypermetropia, black and white eye diagram
Thomson, J. Arthur The Outline of Science volume II (New York, NY: G.P. Putnam's Sons, 1922)