THE IMPORTANCE OF ILLUMINATION TO THE SCHOOL CHILD IS DISCUSSED. VISUAL EFFICIENCY HAS A MARKED EFFECT UPON MANY LEARNING SITUATIONS AND IT IS INFLUENCED BY A NUMBER OF FACTORS--(1) THE STAGE OF GROWTH AND DEVELOPMENT OF THE CHILD'S EYES, (2) THE PRESENCE OF EYE DEFECTS, (3) RELATIVE BRIGHTNESS OF OBJECT AND BACKGROUND (CONTRAST), (4) SIZE OF OBJECT, (5) DISTANCE OF THE OBJECT, (6) AMOUNT OF ILLUMINATION, AND (7) GLARE. ALSO INCLUDED ARE SECTIONS ON--(1) QUANTITY OF ILLUMINATION, (2) QUALITY OF ILLUMINATION AND BRIGHTNESS BALANCE, (3) REFLECTION FACTORS IN THE ENVIRONMENT, (4) NATURAL LIGHTING AND ITS CONTROL, (5) ARTIFICIAL LIGHTING AND ITS CONTROL, AND (6) MAINTENANCE. IN ADDITION THE ROLE OF THE TEACHER IN THE ILLUMINATION PROGRAM IS DEALT WITH IN TERMS OF HOW HE CAN IMPROVE SEEING CONDITIONS IN THE CLASSROOM. (RK)