Las Vegas-A study evaluating IOP measurement performed with Goldmann applanation tonometry (GAT), the digital handheld Tono-Pen XL applanation tonometer (Medtronic Ophthalmics), the Pascal Dynamic Contour Tonometer (PDCT, SMT Swiss Microtechnology AG), and the Ocular Response Analyzer (ORA, Reichert Inc.) indicates that the results obtained with all of those devices may be affected by central corneal thickness (CCT). IOP measurements using the PDCT and ORA, however, appear to be influenced the least, reported Maged Nessim, MD, and coauthors here at the annual meeting of the American Academy of Ophthalmology.