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Clinical performance of non-contact tonometry by Reichert AT550 in glaucomatous patients. 2003

J Jorge, and J M González-Méijome, and J A Díaz-Rey, and J B Almeida, and P Ribeiro, and M A Parafita
Department of Physics (Optometry), School of Sciences, University of Minho, Braga, Portugal. jjorge@fisica.uminho.pt

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.

UI MeSH Term Description Entries
D007429 Intraocular Pressure The pressure of the fluids in the eye. Ocular Tension,Intraocular Pressures,Ocular Tensions,Pressure, Intraocular,Pressures, Intraocular,Tension, Ocular,Tensions, Ocular
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009798 Ocular Hypertension A condition in which the intraocular pressure is elevated above normal and which may lead to glaucoma. Glaucoma, Suspect,Hypertension, Ocular,Glaucomas, Suspect,Hypertensions, Ocular,Ocular Hypertensions,Suspect Glaucoma,Suspect Glaucomas
D005260 Female Females
D005901 Glaucoma An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed) Glaucomas
D005902 Glaucoma, Open-Angle Glaucoma in which the angle of the anterior chamber is open and the trabecular meshwork does not encroach on the base of the iris. Glaucoma Simplex,Glaucoma, Pigmentary,Glaucoma, Simple,Open-Angle Glaucoma,Chronic Primary Open Angle Glaucoma,Glaucoma, Compensated,Glaucoma, Compensative,Glaucoma, Open Angle,Glaucoma, Primary Open Angle,Glaucoma, Secondary Open Angle,Primary Open Angle Glaucoma,Secondary Open Angle Glaucoma,Compensated Glaucoma,Compensative Glaucoma,Open Angle Glaucoma,Open Angle Glaucomas,Open-Angle Glaucomas,Pigmentary Glaucoma,Simple Glaucoma,Simplex, Glaucoma,Simplices, Glaucoma
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014065 Tonometry, Ocular Measurement of ocular tension (INTRAOCULAR PRESSURE) with a tonometer. (Cline, et al., Dictionary of Visual Science, 4th ed) Ocular Tonometry
D015203 Reproducibility of Results The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results. Reliability and Validity,Reliability of Result,Reproducibility Of Result,Reproducibility of Finding,Validity of Result,Validity of Results,Face Validity,Reliability (Epidemiology),Reliability of Results,Reproducibility of Findings,Test-Retest Reliability,Validity (Epidemiology),Finding Reproducibilities,Finding Reproducibility,Of Result, Reproducibility,Of Results, Reproducibility,Reliabilities, Test-Retest,Reliability, Test-Retest,Result Reliabilities,Result Reliability,Result Validities,Result Validity,Result, Reproducibility Of,Results, Reproducibility Of,Test Retest Reliability,Validity and Reliability,Validity, Face

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