ABSTRACT
PURPOSE: Several reports have revealed a difference in various populations regarding the variability of intraocular pressure (IOP) and corneal hysteresis (CH). This retrospective study was created to determine a profile for U.S. Veterans in a large outpatient clinical setting. OVERVIEW AND METHODOLOGY: The objective was to evaluate a random cohort of patient records in this clinical setting to determine the mean and standard deviation (SD) of the following parameters: Goldmann-correlated IOP (IOPg), CH, waveform score, and central corneal thickness from the Reichert Ocular Response Analyzer. RESULTS: All patient records were reviewed by Veteran Health Affairs Eye clinical staff which resulted in data collected on 538 eyes. The mean IOP of this cohort for IOPg was 17.39 (SD 10.08). The mean for CH was calculated at 9.61 (SD 3.04) with a waveform score mean of 5.66 (SD 2.18) and central corneal thickness for 207 eyes was a mean of 545.09 (SD 51.09) nm. CONCLUSION: From the results, IOPg appears to be significantly higher and CH significantly lower than other populations reported in the literature. This information provides an accurate baseline for the evaluation of the U.S. veteran population for future.
Subject(s)
Corneal Diseases/epidemiology , Hypesthesia/epidemiology , Intraocular Pressure/physiology , Veterans , Aged , Corneal Diseases/physiopathology , Epidemiologic Studies , Female , Humans , Hypesthesia/physiopathology , Male , Medical Audit , Middle Aged , United States/epidemiologyABSTRACT
PURPOSE: To evaluate if using the Ehlers correction factor on the intraocular pressure (IOP) measured using the Goldmann applanation tonometer (GAT) improves its agreement with the PASCAL dynamic contour tonometer (DCT). PATIENTS AND METHODS: A total of 120 eyes of 120 individuals were examined. Participants underwent IOP measurement with both the DCT and the GAT and central corneal thickness measurement. The Ehlers correction factor was applied on the GAT IOP measurements to calculate Ehlers-corrected GAT IOP. The agreement between the DCT and GAT, and DCT and Ehlers-corrected GAT IOP was analyzed. The analyses were repeated by stratifying the data by race. RESULTS: The mean IOP of the GAT, DCT, and the Ehlers-corrected GAT was 15.30, 16.78, and 14.68 mmHg, respectively. The agreement as assessed by Bland-Altman plot for the GAT with the DCT and DCT and Ehlers-corrected GAT IOP was +4.1 to -6.9 and +4.15 to -8.25 mmHg, respectively. The results were similar even when stratifying the data by race. CONCLUSION: Using Ehlers correction factor to account for the effect of corneal parameters on the IOP measured by the GAT worsens the agreement with the DCT. This effect remains even when stratifying the data by race.
