Ptolemy, in his treatise Optics, held an extramission-intromission principle of eyesight: the rays (or flux) within the eye shaped a cone, the vertex currently being within the attention, and The bottom defining the visual area. The rays have been sensitive, and conveyed details back again for the observer's intellect about https://surroundsoundsystem21852.blogstival.com/52359443/a-simple-key-for-same-day-glasses-near-me-unveiled