A Pilot Evaluation Assessing the Ease of Use and Accuracy of the New Self/Home-Tonometer IcareHOME in Healthy Young Subjects.
We investigated the ease of use and accuracy of a new self/home-tonometer (IcareHOME) versus Goldmann applanation tonometry (GAT) and the Icare tonometer (Icare) by measuring the diurnal intraocular pressure (IOP).



The right eyes of 43 healthy young subjects were studied. The IOP was measured using the IcareHOME, GAT, and Icare 6 times a day, every 2 hours, from 8:00 to 18:00. The coincidence of the diurnal curves among all tonometers was analyzed using a linear mixed model. The intradevice and interdevice agreement was evaluated using the intraclass correlation coefficients (ICC) and Bland-Altman method. The subjects' perception of the IcareHOME was evaluated using a questionnaire.



The liner mixed model showed similar diurnal IOP curves for all tonometers (P=0.543); however, significant differences were observed between the tonometers over time (P<0.001). The intradevice repeatability was ICC>0.8 among all tonometers, although the interdevice agreement was lowest between the IcareHOME and GAT (ICC=0.641). The IOP values were significantly lower for the IcareHOME than for the GAT at 12:00, 16:00, and 18:00 (P<0.05, Tukey-Kramer test). The mean differences between the Icare and IcareHOME and GAT and IcareHOME were 0.83 and 1.03 mm Hg, respectively (95% limit of agreement: -4.17 to 5.84 mm Hg and -3.91 to 5.98 mm Hg, respectively). Regarding the subjects' perception of handling the IcareHOME, 17 (39.5%) subjects answered "easy to use," 20 (46.5%) answered "normal," and six (13.9%) answered "difficult to use."



The IcareHOME can be used as a self/home-tonometer; however, it may result in lower IOP values.
*Department of Ophthalmology, Saneikai Tsukazaki Hospital, Himeji, Hyogo †Department of Ophthalmology and Visual Sciences, Graduate School of Biomedical Sciences, Hiroshima University, Higashihiroshima, Hiroshima, Japan.
Asuka
A
Noguchi
Shunsuke
S
Nakakura
Yuki
Y
Fujio
Yasuko
Y
Fukuma
Etsuko
E
Mori
Hitoshi
H
Tabuchi
Yoshiaki
Y
Kiuchi
D000328:Adult; D004867:Equipment Design; D005260:Female; D005901:Glaucoma / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D010865:Pilot Projects; D011446:Prospective Studies; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation*; D055815:Young Adult