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[Accuracy of intraocular pressure measurement using NCT after LASIK].

Yubing Chen, Gang-Ping Zhao, Meirong Pan, Qihua Zheng

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Abstract

PURPOSE: To study the accuracy of the intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) with noncontact tonometer (NCT). METHODS: One hundred and eighty cases (256 eyes) myopias that had undergone LASIK were studied. IOP, corneal thickness and corneal curvature were measured before and after LASIK. The correlations were analyzed. RESULTS: The decrease of Iop using NCT was significantly obvious after LASIK (P < 0.001). One year after LASIK mean IOP drop was 6.54 +/- 2.1 mmHg. The reduction of IOP may be related to the decrease in corneal thickness and corneal curvature (P < 0.01). Regression equation for IOP drop (mmHg) = 0.355 + 0.0342X1 + 0.365X2 [X1 = decrease in corneal curvature (D), X2 = ablation depth (microm)] CONCLUSIONS: The IOP readings after LASIK were lower than the real IOP values. IOP readings after LASIK were influenced by corneal thickness and refraction degree.

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What this paper is about

PURPOSE: To study the accuracy of the intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) with noncontact tonometer (NCT). METHODS: One hundred and eighty cases (256 eyes) myopias that had undergone LASIK were studied. IOP, corneal thickness and corneal curvature were measured before and after LASIK. The correlations were analyzed. RESULTS: The decrease of Iop using NCT was significantly obvious after LASIK (P < 0.001). One year after LASIK mean IOP drop was 6.54 +/- 2.1 mmHg. The reduction of IOP may be related to the decrease in corneal thickness and corneal curvature (P < 0.01). Regression equation for IOP drop (mmHg) = 0.355 + 0.0342X1 + 0.365X2 [X1 = decrease in corneal curvature (D), X2 = ablation depth (microm)] CONCLUSIONS: The IOP readings after LASIK were lower than the real IOP values. IOP readings after LASIK were influenced by corneal thickness and refraction degree.

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Available abstract

PURPOSE: To study the accuracy of the intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) with noncontact tonometer (NCT). METHODS: One hundred and eighty cases (256 eyes) myopias that had undergone LASIK were studied. IOP, corneal thickness and corneal curvature were measured before and after LASIK. The correlations were analyzed. RESULTS: The decrease of Iop using NCT was significantly obvious after LASIK (P < 0.001). One year after LASIK mean IOP drop was 6.54 +/- 2.1 mmHg. The reduction of IOP may be related to the decrease in corneal thickness and corneal curvature (P < 0.01). Regression equation for IOP drop (mmHg) = 0.355 + 0.0342X1 + 0.365X2 [X1 = decrease in corneal curvature (D), X2 = ablation depth (microm)] CONCLUSIONS: The IOP readings after LASIK were lower than the real IOP values. IOP readings after LASIK were influenced by corneal thickness and refraction degree.

Key concepts: LASIK, Keratomileusis, Intraocular pressure, Ophthalmology, Medicine, Ablation, Cornea, Internal medicine

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