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Abstract #78210 Published in IGR 19-4
Intra-ocular pressure variation associated with the wear of scleral lenses of different diameters
Michaud L; Samaha D; Giasson CJContact Lens and Anterior Eye 2018; 0:
PURPOSE: To evaluate the variation of intra-ocular pressure during scleral lens wear, and the influence of the lens diameter on the results. METHODS: This is a prospective, randomized study performed on Caucasian subjects (16 F; 5 M), aged 24.7 + 4.1 y.o. A diurnal variation pattern (IOPg) was established, then, transpalpebral IOP (IOPt) was taken before and during SL wear. One eye, randomly fitted with a 15.8 diameter SL (L1), was compared to the fellow eye, fitted with an 18 mm SL of the same design, thickness and material (L2). Anterior segment tomography was taken pre-and after lens removal. RESULTS: Baseline IOPg (L1:15.2 + 3.1 mm HG; L2: 15.1 +/- 2.8 mm) did not reveal significant diurnal variations. Wearing L1, IOPt rose from 10.1 + 1.9 mm HG to 14.4 + 5.5 mm HG after 4.5 + 0.3 hrs, while with L2, it rose from 9.2 + 2.1 mm HG to 14.4 + 4.8 mm Hg. This difference is statistically significant based on time but not on lenses. Anterior segment parameters did not vary except for the anterior chamber volume (L1: -1.53 + 7.61 mm; L2: -3.47 + 6.4 mm), and for the corneal thickness (+2.1% with L1 and L2). CONCLUSION: These results suggest that, as evaluated with a non-standard transpalpebral methodology, IOP during scleral lens wear may be increased in average by 5 mm Hg, regardless of the lens diameter. More work is needed to confirm if practitioners should be warned when using SL on populations at risk for glaucoma.
École d'optométrie, Université de Montréal, 3744 Jean-Brillant, Suite 270, Montreal H3T 1P1, Canada. Electronic address: langis.michaud@umontreal.ca.
Full articleClassification:
6.1.3 Factors affecting IOP (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
2.2 Cornea (Part of: 2 Anatomical structures in glaucoma)
2.3 Sclera (Part of: 2 Anatomical structures in glaucoma)