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Impressum
Measurement of Intraocular Pressure by Contact Lens Tonometry as Modified Ophthalmodynamometry
Libera T., Jonas J. B.
Klinikum Mannheim gGmbH, Augenklinik, Mannheim
Pupose: The contact lens tonometer (SmartLens®) is a new device
for the continous 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 prospective masked study included 43
individuals, for whom consecutively intraocular pressure was measured
by Goldmann applanation tonometry and subsequently by contact lens tonometry.
Mean age of the patients was 64.4 ± 14.3 years (Median,: 66 years;
range, 18 - 87 years).
Results: Mean intraocular pressure measurements obtained by contact
lens tonometry were 19. ± 5.9 mm Hg (right eyes) and 19.4 ±
6.4 mm Hg (left eyes). They were 3.32 ± 3.99 mm Hg (right eyes)
and 2.65 ± 3.44 mm Hg (left eyes) higher than the measurements
obtained by applanation tonometry (16.2 ± 4.5 mm Hg (right eyes);
16.6 ± 5.2 mm Hg (left eyes)).. The difference between the two
methods was statistically independent (P=0.61) of the age of the patients.
Conclusions: Contact lens tonometry is a possibility to determine
the intraocular pressure while marked differences may occur between contact
lens tonometry and conventional Goldmann applanation tonometry.