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Impressum
Reproducibility of Intraocular Pressure Measurements by contact lens tonometry as modified ophthalmodynamometry
Libera T., Jonas J. B.
Klinikum Mannheim gGmbH, Augenklinik, Mannheim
Purpose: The contact lens tonometer (SmartLens®; Ophthalmic
Development Company AG, Zürich) is a new device for the continuous
measurement of intraocular pressure with the possibility of simultaneous
observation of the fundus of the eye. It represents a modified form of
ophthalmodynamometry. The purpose of the present study was to evaluate
and compare intraocular pressure measurements obtained by contact lens
tonometry with measurements performed by conventional Goldmann applanation
tonometry.
Patients and Methods: The study included 9 individuals, for each
of whom intraocular pressure was repeatedly (x5) measured by contact lens
tonometry. Mean age of the patients was 67.1 ± 10.5 years (median,
66 years; range, 48-82 years). Criterion for inclusion in the study were
outstanding collaboration of the patient, easy access to the cornea, and
performance of a series of measurements with at least 5 single measurements
in a row.
Results: The coefficient of variation determined as mean of the
means divided by the mean of the standard deviation was 6.5%. It was statistically
independent of age of the patient (P=0.82), right eye or left eye (P=0.79),
and intraocular pressure measurement by applanation tonometry (P=0.69).
Conclusions: In agreement with the literature, the variation coefficient
is under good examination conditions about 6.5%. Contact lens tonometry
as modified ophthalmodynamometry shows a relatively reasonable reproducibility.
(1) Troost R, Vogel A, Beck S, Schwenn O, Grus F, Pfeiffer N. Comparison
of two intraocular pressure measurement methods: Smartlens® and Goldmann´s
tonometry. Invest Ophthalmol (ARVO Abstract): 2001; Absract # 4409