The Position of the Retina in Near and Far Sight
A flattened shape of the globe of the eye causes farsightedness and an elongated shape of the globe of the eye causes nearsightedness. The diagram illustrates the position of the retina in these conditions. Labels: B, natural sight; G, farsightedness; C, nearsightedness.
Steele, Joel Dorman Hygienic Physiology (New York, NY: A. S. Barnes & Company, 1888)