Ptolemy, in his treatise Optics, held an extramission-intromission principle of eyesight: the rays (or flux) with the eye fashioned a cone, the vertex being within the eye, and the base defining the Visible area. The rays were being delicate, and conveyed info again for the observer's intellect about the gap https://cesarhpknc.blogginaway.com/30459911/prescription-blue-light-glasses-an-overview