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<p>Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis</p>
摘要： Background: Corneal refractive surgery is widely used worldwide. Myopia is the most common reason for laser-assisted corneal refractive surgery (LASIK) and one of the risk factors for glaucoma. Intraocular pressure (IOP) measurement becomes variable postoperatively as the results are affected by the decrease in corneal thickness and biomechanics. This prospective clinical case study attempted to establish a simple correction formula for the calculation of IOP in post-LASIK myopic patients. Methods: This study included 300 eyes of 150 patients with myopia and myopic astigmatism as a refractive error who underwent LASIK. IOP was measured preoperatively and 6 months postoperatively. Preoperative and postoperative corneal thickness as well as ablation depth were measured. Statistical analysis was performed to detect the relationship between ablation depth and change in IOP. An attempt was made to construct a correction formula for the calculation of post-LASIK IOP. Results: The age of the patients ranged between 18 and 50 (mean ± SD 34.78±8.8) years. The spherical equivalent of refractive error ranged between ?1.5 and ?10 diopters. The mean IOP decreased signi?cantly from 15.72±2.37 mmHg preoperatively to 11.71±2.24 mmHg postoperatively, with a mean difference of 4±1.75 mmHg (p?0.001). A positive correlation was detected between corneal thickness and IOP difference among patients both preoperatively and postoperatively (p?0.001). A positive correlation was identi?ed between ablation depth and IOP change (p?0.001). The correction formula for IOP was established: Real IOP=4+0.7(preoperative IOP)?0.3(ablation depth). Conclusion: IOP measurements change after corneal refractive surgery with LASIK. A corrected formula may be a good option for the proper calculation of post-LASIK IOP.
关键词： intraocular pressure calculation,Goldmann applanation tonometry,laser in situ keratomileusis,glaucoma,post-LASIK glaucoma
更新于2025-09-16 10:30:52
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A comparison of NCT, Goldman application tonometry values with and without fluorescein
摘要： Purpose: The aim of the study was to statistically compare intraocular pressure (IOP) values measured using noncontact tonometer (NCT), Goldmann applanation tonometry (GAT) with fluorescein (fGAT), and GAT without fluorescein (nGAT). The study was also performed to test whether the values obtained using each technique change in accordance with the central corneal thickness (CCT) and refractive and keratometric values. Study design: This study was a prospective study of 188 eyes of 94 healthy volunteers. Methods: IOP was measured using fGAT, nGAT and NCT. CCT, refractive values, and keratometric values were measured, and the correlations and differences in the IOP for each tonometer were investigated. Results: The mean IOP values obtained with the NCT, nGAT, and fGAT were 17.5±3.7, 12.3±2.7, and 12.5±2 mmHg. The mean CCT was 538.2±34.4 μm, the mean refractive value was 0.9±1.2 D, and the mean keratometric value was 43.5±1.5 D. NCT was positively correlated with fGAT and GAT values and was significantly higher than both the values. There were no differences between fGAT and GAT values. No correlation was observed between the CCT and keratometric and refractive values and the difference between NCT and nGAT or fGAT. Conclusion: Differences in the measurements obtained using nGAT and fGAT were insignificant (P.0.05). Both values were positively correlated with NCT measurements (r =0.354, P,0.05) and were independent of CCT, keratometry, and refraction values. nGAT appears to be suitable for use in routine clinic practice.
关键词： central corneal thickness,Goldmann applanation tonometry,intraocular pressure,refractive value,noncontact tonometry,fluorescein
更新于2025-09-09 09:28:46