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PURPOSE: The Icare ONE (Finland Oy) rebound tonometer may have promise for home tonometry in children with glaucoma. The purpose of this study was: (1) to assess the feasibility of Icare ONE home tonometry in a small number of children with and without glaucoma and (2) to characterize diurnal intraocular pressure (IOP) variations in children with and without glaucoma. METHODS: Patients were recruited from Duke pediatric ophthalmology clinic. Parents underwent in-clinic training for Icare ONE tonometry. Parents were instructed to record the subject's IOP using Icare ONE at 6 time intervals daily for 10 sequential days. RESULTS: Eight normal subjects (16 eyes) and 10 subjects (10 eyes) with glaucoma were included. All parents successfully performed Icare ONE home tonometry. In-clinic Icare ONE IOP exceeded Goldmann applanation in both groups. Normal subjects (mean age, 11.8 y) had a mean daily IOP range of 4.8±4.6 mm Hg for right eyes and 5.2±1.7 mm Hg for left eyes, and demonstrated relative peaks in the morning and relative troughs in the evening. Subjects with glaucoma (mean age, 12.4 y) had a mean daily IOP range of 8.6±8.2 mm Hg, and demonstrated an even distribution of relative peaks and troughs throughout the day. CONCLUSIONS: Icare ONE home tonometry seems feasible in a small number of children. Normal eyes demonstrated smaller daily IOP ranges than glaucomatous eyes. Normal eyes were also more likely to show a relative early morning IOP peak and a late evening IOP trough. It is likely that the limited sampling in this study limits its generalizability to all children with glaucoma or to normal children.
*Department of Ophthalmology, University of California Davis, Sacramento, CA †Duke Eye Center, Durham, NC.
Full article9.1.2 Juvenile glaucoma (Part of: 9 Clinical forms of glaucomas > 9.1 Developmental glaucomas)
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)