Isaac Newton's description of the optic chiasm

Sir Isaac Newton is widely regarded as one of the greatest scientific minds in history, with seminal contributions across mathematics, physics-particularly optics-and the formulation of the law of universal gravitation. Less well known, however, is his extraordinary and rarely recognized contribution to the field of neurology: the early conceptualization of fiber decussation within the optic chiasm. Through his studies on light and vision, Newton proposed that optic nerve fibers cross at the chiasm-a hypothesis that would later be anatomically confirmed and provided the basis for understanding the classic patterns of visual field deficits.