Al-Razi Abū Bakr Muhammad ibn Zakariyyā (Rhazes) (c. 250/865-313/925) was one of the encyclopedic beautiful minds in the history of science in Islam. The experiences that he collected from different fields contributed to his success in the other scientific branches in which he studied. Alchemy led him to modern chemistry and to build a modern experimental laboratory, where he learnt to extract medical drugs. He turned himself to being a treating pharmacist in the hospital, where he later became an excellent doctor treating the poor and princes alike. In Al-Razi’s book “Doubts on Galen (Shukûk ‘ala Jâlînûs)” are the words of Galen, the senior of Physicians, from the books attributed to him. In this book, Al-Razi asks the right questions, and this is what distinguishes him as a high-class scientist. In this analytical article, the physical information was extracted from AL-Razi’s experiments, observations, and comments about optics, how stars are seen, how light, image, and color reach our eyes, what are the dimensions and distances of the stars and the planets from us and the rationale for inaccuracies in those dimensions. Al-Razi`s beautiful method is to teach physics and optics and when he explains an idea he approves it by a proof or disapproves it by a proof, looking for the correct place for every idea and he judges it by his “Natural Balances” in his encyclopedic mind. Al-Razi`s articles on optics and ophthalmology talk about the structure of the eye, and how the eye sees the objects, by comparing them with Galen’s books, indicates the deep awareness of Al-Razi of the mechanism of vision in the eye in humans and animals. Razi also corrected Galen’s views about strabismus and amblyopia, and explained the mechanisms of vision in the dark and after sleep. Al-Razi also explained some of his experiments in optics and astronomical observations, suitable to be applied today, and he talked about his experiments about seeing two objects together, identical or different, together in a straight line or close to each other at the same level or in a different level. He mentioned the properties and correct comparisons of concave and convex mirrors and their use in the Abbasid era in which Razi lived. We repeated his experiments as he described and confirmed the validity and accuracy of his observations.