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A. K. Sousa, T. S. Prata, C. A. A. Garcia Filho, L. M. Doi, A. Paranhos, Jr.; Intraocular Pressure, Corneal Thickness, and Corneal Hysteresis During Pregnancy. Invest. Ophthalmol. Vis. Sci. 2007;48(13):3154.
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Decrease in intraocular pressure (IOP) during pregnancy has been reported by previous study. The goal of this study was to evaluate the Goldmann and corneal-compensated IOP, corneal central thickness (CCT), and corneal hysteresis in pregnant women.
A total of 24 pregnant women (48 eyes - pregnant group) and 33 patients without any systemic disease (66 eyes - control group) were enrolled. All subjects underwent a complete ophthalmic evaluation and patients with any significant ocular disease were excluded. IOP was measured using Goldmann applanation tonometer (GAP), Pascal Dynamic Contour Tonometer (DCT), and Ocular Response Analyzer (ORA) in random order. Corneal hysteresis was evaluated by ORA and central corneal thickness (CCT) by ultrasound pachymeter. Three measurements of each device were taken and the mean measurements were used for the analysis.The difference in IOP readings between the three tonometries was analyzed. The corneal hysteresis and CCT was compared between the two groups.
In the pregnant group the mean (standard deviation [SD]) IOP was 10,8 (2,2) mmHg for the GAP; 12,7 (2,4) mmHg for the ORA; 15,2 (2,3) mmHg for DCT (P<0.001). The mean (SD) CCT in the pregnant and control group was 548 (26) µm and 547 (36) µm, respectively (P=0,83). The mean (SD) corneal hysteresis in pregnant group and in control group were, respectively, 11,5 (0,9) mmHg and 10,4 (1,1) mmHg (P<0.01). The mean corneal hysteresis reading was almost constant throughout the gestation period.
The pregnant women showed lower Goldmann IOP in comparison with measurements of ORA and DCT. The CCT was normal during pregnancy while corneal hysteresis was increased, althought constant throughout the gestation period. The difference in IOP readings of pregnant group did not correlate with CCT and hysteresis.
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