Fig. 9. The broad hash marks of the fixation ring/gauge are centered over the 75-degree meridian, using the 6:00 limbal mark for orientation. Alternatively, a Mendez gauge may be used. (Reprinted from Hardten DR, Lindstrom RL, Davis EA. Phakic Intraocular Lenses: Principles and Practice. Thorofare, NJ: SLACK Incorporated, 2004, with permission.)