A SIMPLE KEY FOR SAME DAY GLASSES NEAR ME UNVEILED

Ptolemy, in his treatise Optics, held an extramission-intromission principle of eyesight: the rays (or flux) in the eye fashioned a cone, the vertex remaining within the attention, and the base defining the visual field. The rays were being delicate, and conveyed info again into the observer's intellect about the space and orientation of surfaces.T