Fig. 2. Ablation plume created by 193-nm excimer pulse at 900 mJ/cm2 per pulse. High-speed photograph obtained by illumination with Nd:YAG laser at 532 nm 50 msec after the excimer pulse struck the corneal surface (original magnification ×4.5). (Puliafito CA, Stern D, Krueger RR, et al: High-speed photography of the excimer laser ablation of the cornea. Arch Ophthalmol 105:1255, 1987)