Opus majus: A translation by Robert Belle Burke, المجلد 2

according Alhazen altitude angle animals appear Apuleius Aristotle Aristotle says Artephius Averroës Avicenna says blessings body cathetus cause celestial sphere CHAPTER Christ Cicero circle color common nerve concave concerning cone consider consolidativa cornea divine equal evident evil fact faculty fall felicity glacialis heavens Hence horizon human Ibid infinite injury kind light likewise matter means medium mind mirror moon moral moral philosophy Moreover motion namely nature object of vision object seen owing pass perceive perception perpendicular philosophers pia mater plane Plato pleasure portion position possess Ptolemy rainbow reason reflection refracted refracted rays regard sage Saracens scintillation second book Seneca says sense sensible Socrates solar pyramid soul sphere spherical spiritual stars statement surface terminate vision things third book tion truth Tusculan Disputations uvea vapors vices virtue visible object visual pyramid visual ray vitreous humor Wherefore whole