Test retest variability of TonoPen AVIA

• Published in: Indian journal of ophthalmology 2013-03, Vol.61 (3), p.129-131
• Main Authors: Bhartiya, Shibal, Bali, Shveta, James, Mathew, Panda, Anita, Dada, Tanuj
• Format: Article
• Language: English
• Subjects: Adult; Amniotic membrane; Angle closure glaucoma; astigmatism; autografting; Bayes′s theorem; Brief Communication; Care and treatment; Color vision; Diagnosis; Equipment Design; farnsworth-munsell 100 hue test; Female; Fibrin glue; fibrin tissue adhesive; Geleophysic dysplasia; Glaucoma; Glaucoma - diagnosis; Glaucoma - physiopathology; Health aspects; Humans; Humphrey field analyzer; initiating treatment; Insulin-like growth factor 1; Intraocular Pressure; Intraocular pressure rise; iridociliary cyst; isopropyl unoprostone; laser cyclophotocoagulation; Male; Measurement; Measuring instruments; microperimetry; mitomycin C; monocular trial; multiple sclerosis; octreotide; Ophthalmology; pattern visual evoked potentials; phacoemulsification; platelet derivated growth factor; Pressure; proliferative vitreoretinopathy; Prospective Studies; pterygium; Reproducibility of Results; retinitis pigmentosa; risk factors; secondary IOL implantation; sutures; Tonometry; Tonometry, Ocular - instrumentation; tonopen; trabeculectomy; transforming growth factor ß; vertical fixation
• ISSN: 0301-4738; 1998-3689
• DOI: 10.4103/0301-4738.109384

The study was conducted to evaluate the intra-session repeatability of Tonopen AVIA (TPA). 180 eyes of 180 patients (50 eyes with glaucoma, 130 eyes of controls) were recruited for this observational study. The mean age of patients enrolled in the study was 43.9 ± 16.7 yrs (84 males, 96 females). Mean IOP recorded with Tonopen AVIA was 19.5 ± 9.5 mmHg, 19.4 ± 9.6 mmHg and 19.3 ± 9.2 mmHg, respectively in the first, second and third instances (P = 0.656). The intraclass correlation coefficient (ICC) ranged from 0.996 (95% CI: 0.956 - 0.998) for glaucoma subjects to 0.958 (95% CI: 0.934 - 0.975) for controls. The coefficient of variation in the study population ranged from 3.47% (glaucoma patients) to 8.10% (healthy controls), being 6.07% overall. The coefficient of repeatability varied between 2.96 (glaucoma patients), 3.35 (healthy controls) to 3.24 (overall). Thus, the Tonopen Avia shows good intrasessional repeatability of IOP in both glaucomatous patients and healthy subjects.