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Abstract #6372 Published in IGR 3-2
Change in intraocular pressure in myopic eyes measured with contact and non-contact tonometers after laser in situ keratomileusis
El Danasoury MA; El Maghraby A; Coorpender SJJournal of Refractive Surgery 2001; 17: 97-104
PURPOSE: To study the change in the intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) for correction of myopia. METHODS: One hundred and twenty consecutive myopic eyes (60 patients) were included in a prospective study. All eyes received LASIK with the Nidek EC-5000 excimer laser and the Chiron Automated Corneal Shaper. Baseline refraction, keratometry, pachymetry, ablation depth, and IOP measured by Goldmann applanation tonometry and non- contact air puff tonometry were correlated with the IOP change after surgery. Sixty healthy eyes of 30 subjects served as controls. RESULTS: At six months, 108 eyes (90%) were examined. Compared to preoperative values, IOP decreased in 103 eyes (95.4%) when measured with applanation tonometry; it decreased in all eyes when measured with air puff tonometry. Mean change in IOP was -4.3 ± 2.1 mmHg (range, -10.0 to +1.0 mmHg) with the applanation and -6.1 ± 2.3 mmHg (range, -12.0 to -1.0 mmHg) with air puff tonometry. The IOP change measured with either instrument correlated significantly with the baseline IOP (p < 0.001) and the ablation depth (air puff, P < 0.001, applanation; P = .006). CONCLUSIONS: IOP decreased significantly after LASIK when measured with either Goldmann (mean 4.3 mmHg) or air puff (mean 6.1 mmHg) tonometers. This decrease may delay the diagnosis or affect the management of future glaucoma that may develop in a myopic eye that received LASIK.
Dr M.A. El Danasoury, Magrabi Eye Center, Abu Dhabi, United Arab Emirates. malaam@emirates.net.ae
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)