This current research builds(สร้าง) upon the foundation set(จัดเตรียม) by the late Gordon Walls, a UC Berkeley professor(ศาสตราจารย์) of optometry(นักทัศนมาตร) who published "The Vertebrate Eye and Its Adaptive Radiation" in 1942. The classic text (ข้อความ) on eye physiology put forward the theory(ทฤษฎี), generally accepted(ยอมรับ), that slit-shaped pupils allow(ยอมให้) for different musculature and a greater range(ช่วง) in the amount(จำนวน) of light entering the eye