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Abstract #6693 Published in IGR 4-1
Accuracy and predictability of the compensatory function of Orbscan II in intraocular pressure measurements after laser in situ keratomileusis
Lee DH; Seo S; Shin SC; Chung EH; Turner TTJournal of Cataract and Refractive Surgery 2002; 28: 259-264
PURPOSE: To evaluate the usefulness of the compensatory function of Orbscan II (Orbtek, Bausch & Lomb) for measuring postoperative intraoperative pressure (IOP) in laser in situ keratomileusis (LASIK) patients. METHODS: Two hundred and ten patients had LASIK using the Hansatome microkeratome (Bausch & Lomb) and the MEL 70 G-scan laser (Aesclepion-Meditec) and were examined retrospectively. The patients included in the study were divided into two groups: group 1, 123 eyes with less than -6.0 diopters (D) of myopia; group 2, 60 eyes with more than -6.0 D of myopia. The IOP was measured preoperatively and two and four weeks after LASIK using a noncontact tonometer (NCT CT-60, Topcon). The results were corrected with the Orbscan II program. RESULTS: The mean IOPs in group 1 were 16.35 mmHg ± 2.90 (SD) preoperatively, 10.80 ± 2.21 mmHg at two weeks, and 10.63 ± 2.28 mmHg at four weeks. After compensation with Orbscan II, the two- and four-week values were 16.81 ± 3.14 and 16.68 ± 3.22 mmHg, respectively. The mean IOPs in group 2 were 17.63 ± 2.93, 10.07 ±1.55, and 10.43 ± 1.84 mmHg, respectively; after compensation, these were 18.40 ± 4.09 and 18.05 ± 4.09 mmHg, respectively. After compensation with Orbscan II, there were no statistically significant differences between the preoperative and postoperative IOPs. CONCLUSIONS: Orbscan II may help predict actual IOP values after LASIK and avoid the misinterpretation of high IOPs as normal IOPs.
Dr. D.H. Lee, Department of Ophthalmology, Ilsan Paik Hospital, Inje University, Ilsan, Korea. dhlee@ilsanpaik.ac.kr
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
8.4 Refractive surgical procedures (Part of: 8 Refractive errors in relation to glaucoma)