Fig. 10. The single footplate diamond blade is inserted perpendicular to the corneal surface and at the peripheral most extent of clear corneal tissue. In this case, the nomogram calls for arcuate incisions of 45 degrees. Therefore, the incision is begun approximately 22.5 degrees to one side of the broad hash mark. (Reprinted from Hardten DR, Lindstrom RL, Davis EA. Phakic Intraocular Lenses: Principles and Practice. Thorofare, NJ: SLACK Incorporated, 2004, with permission.)