Non correct. Understanding of the form is a must. Drawing what you know is the basic principle. If you draw what you see without understanding of perspective, b

Non correct. Understanding of the form is a must. Drawing what you know is the basic principle. If you draw what you see without understanding of perspective, basic forms etc you will end with optically build representation of reality. In case of the eye you must know how anatomically is constructed and draw by combining your knowledge with what you see.