Effects of a Water-loading Test on Intraocular Pressure and Corneal Hysteresis in Young Healthy Subjects
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Purpose:To evaluate the influence of a water-loading test on corneal compensated intraocular pressure (IOPcc) and corneal hysteresis (CH) in young healthy subjects.Materials and Methods:Forty healthy adult subjects (20 female and 20 male), with a mean age of 27.552.57 years (range, 24 to 35 y), participated in this prospective study. IOPcc and CH were measured for 1 eye from each participant with an Ocular Response Analyser. These measurements were taken before and 10, 20, and 30 minutes after water loading.Results:Thirty-seven right and 3 left eyes of the 40 subjects fulfilled the study's inclusion criteria. A statistically significant increase in IOPcc was observed between 0 and 10 minutes (P=0.002) and a significant decrease between 10 and 30 minutes (P<0.001). We did not observe any statistically significant changes in CH. The Pearson correlation revealed that there was a weak negative correlation between IOPcc and CH measurements taken at the baseline, 10 minutes, and 30 minutes [r values were -0.275 (P=0.086), -0.369 (P=0.019), and -0.246 (P=0.125), respectively].Conclusions:This study revealed changes in IOPcc and CH after a water-loading test, but only the change in the IOPcc measurement was statistically significant. The association of changes in IOP and CH identified in this study suggests that IOP changes might alter corneal biomechanical properties.