Figure 1.

Schematic diagram of the Badal optometer attached to the Zeiss IOLMaster 700 optical biometer. The four emoticon fixation targets are also displayed. All distances are expressed in millimeters. LPF, longpass dichroic filter; LCD, liquid crystal display; V, “visible” radiation (400–650 nm); IR, “infrared” radiation (>650 nm). Figure reproduced from Hughes et al.¹⁸ with permission from John Wiley and Sons.