Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis

Hazem Helmy,1 Omar Hashem2 1Glaucoma and Optic Nerve Disease Department, Research Institute of Ophthalmology, Giza, Egypt; 2Cornea and Refractive Surgery Department, Research Institute of Ophthalmology, Giza, EgyptCorrespondence: Hazem Helmy Email hazem.helmy@yahoo.comBackground: Corneal refractive...

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Autores principales:	Helmy H, Hashem O
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	intraocular pressure calculation post lasik glaucoma goldman applanation tonometry glaucoma laser in situ keratomiluesis . Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/b7a1f41f69674c91948fb8520ceafbfd
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spelling	oai:doaj.org-article:b7a1f41f69674c91948fb8520ceafbfd2021-12-02T00:55:49ZIntraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis1177-5483https://doaj.org/article/b7a1f41f69674c91948fb8520ceafbfd2020-02-01T00:00:00Zhttps://www.dovepress.com/intraocular-pressure-calculation-in-myopic-patients-after-laser-assist-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Hazem Helmy,1 Omar Hashem2 1Glaucoma and Optic Nerve Disease Department, Research Institute of Ophthalmology, Giza, Egypt; 2Cornea and Refractive Surgery Department, Research Institute of Ophthalmology, Giza, EgyptCorrespondence: Hazem Helmy Email hazem.helmy@yahoo.comBackground: 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 significantly 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 identified 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.Keywords: intraocular pressure calculation, post-LASIK glaucoma, Goldmann applanation tonometry, glaucoma, laser in situ keratomileusisHelmy HHashem ODove Medical Pressarticleintraocular pressure calculationpost lasik glaucomagoldman applanation tonometryglaucomalaser in situ keratomiluesis .OphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 509-516 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	intraocular pressure calculation post lasik glaucoma goldman applanation tonometry glaucoma laser in situ keratomiluesis . Ophthalmology RE1-994
spellingShingle	intraocular pressure calculation post lasik glaucoma goldman applanation tonometry glaucoma laser in situ keratomiluesis . Ophthalmology RE1-994 Helmy H Hashem O Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis
description	Hazem Helmy,1 Omar Hashem2 1Glaucoma and Optic Nerve Disease Department, Research Institute of Ophthalmology, Giza, Egypt; 2Cornea and Refractive Surgery Department, Research Institute of Ophthalmology, Giza, EgyptCorrespondence: Hazem Helmy Email hazem.helmy@yahoo.comBackground: 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 significantly 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 identified 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.Keywords: intraocular pressure calculation, post-LASIK glaucoma, Goldmann applanation tonometry, glaucoma, laser in situ keratomileusis
format	article
author	Helmy H Hashem O
author_facet	Helmy H Hashem O
author_sort	Helmy H
title	Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis
title_short	Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis
title_full	Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis
title_fullStr	Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis
title_full_unstemmed	Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis
title_sort	intraocular pressure calculation in myopic patients after laser-assisted in situ keratomileusis
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/b7a1f41f69674c91948fb8520ceafbfd
work_keys_str_mv	AT helmyh intraocularpressurecalculationinmyopicpatientsafterlaserassistedinsitukeratomileusis AT hashemo intraocularpressurecalculationinmyopicpatientsafterlaserassistedinsitukeratomileusis
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Intraocular Pressure Calculation in Myopic Patients After Laser-Assisted In Situ Keratomileusis

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