AM Skeffington is widely considered to be the grandfather of behavioral optometry. He revolutionized our understanding of the visual process with his understanding of ‘The Four Circles’ and lectured all across the globe on vision and visual therapy. In this course intended for vision therapists, ‘The Four Circles’ are discussed in some detail but their clinical relevance and insight into the visual function of the patient will be emphasized. Many different vision therapy techniques will be discussed and how ‘The Four Circles’ may be used to help understand the functional visual problems patients face and how we may be better able to guide them in therapy.