Figures & data
Figure 1. Simultaneous accommodation and convergence responses to targets between 33c and 200 cm (0.5–3 diopter(d) and meter angle (MA) demand). Solid line: Accommodation in D, dashed line: Convergence in MA. Grey line: Perfect theoretical response. 1A1 and 1A2: Same patient, same naturalistic target 4 minutes apart. 1B1 and 1B2: Same patient before and after orthoptic investigation, demonstration and encouragement. 1C1 and 1C2: Same patient, different targets, excessive but erratic vergence and weak accommodation in C1 and normal vergence and weak accommodation in C2. D: Linked vergence and accommodation spasm for 100 cm target, but not for 33 cm or 200 cm target. E: Unlinked accommodation spasm at 50 cm and 100 cm, but normal vergence.
