Clinical performance of non-contact tonometry by Reichert AT550® in glaucomatous patients

• Published in: Ophthalmic & physiological optics Vol. 23; no. 6; pp. 503 - 506
• Main Authors: Jorge, J., González-Méijome, J. M., Díaz-Rey, J. A., Almeida, J. B., Ribeiro, P., Parafita, M. A.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01.11.2003; Blackwell
• Subjects: Biological and medical sciences; Exfoliation Syndrome - physiopathology; Female; glaucoma; Glaucoma - physiopathology; Glaucoma and intraocular pressure; Glaucoma, Open-Angle - physiopathology; Goldmann tonometry; Humans; Intraocular Pressure; Male; Medical sciences; Middle Aged; non-contact tonometry; Ocular Hypertension - physiopathology; Ophthalmology; Reichert AT550; reliability; Reproducibility of Results; Tonometry, Ocular - instrumentation; Tonometry, Ocular - methods; Performance evaluation; Human; Eye disease; Glaucoma (eye); Exploration; Tonometry; Measurement method; Non contact measurement; Intraocular pressure
• ISSN: 0275-5408; 1475-1313
• DOI: 10.1046/j.1475-1313.2003.00139.x

Measuring intraocular pressure (IOP) by non‐contact tonometry (NCT) has been demonstrated to be a valid and reliable technique to be used in primary eye care; it is easier to use, it does not transmit infectious diseases, and it is not necessary to use anaesthetic or staining eye drops. Recently, a new NCT device has showed an excellent level of agreement with Goldmann tonometry, but there are no records of its performance in glaucomatous eyes. To rectify this, IOP was measured in twenty‐two patients (44 eyes) receiving medical treatment to control elevated IOP, with AT550® and Goldmann tonometry. Mean values of IOP were 18.98 ± 2.77 and 19.08 ± 3.02 mmHg using Goldmann and AT550®, respectively. Plots of differences against means displayed good agreement (mean difference ± limits of agreement, −0.09 ± 3.30); this value was not significantly different from zero (t‐test for dependent samples, p = 0.709). In conclusion, IOP values as measured with the AT550® NCT are clinically comparable with those obtained with Goldmann tonometry in glaucomatous patients. This validates this NCT not only for screening of IOP but to follow‐up glaucomatous patients with a rapid, non‐invasive method.