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Dynamic contour tonometry: handheld versus slit-lamp-mounted.

Pascal B Knecht1, Martina M Bosch, Marcel N Menke

  • 1University Hospital Zurich, Department of Ophthalmology, Zurich, Switzerland. pascal.knecht@usz.ch

Ophthalmology
|June 9, 2009
PubMed
Summary
This summary is machine-generated.

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The new handheld dynamic contour tonometer (hh-DCT) shows strong agreement with the slit-lamp-mounted DCT (sl-DCT) for intraocular pressure (IOP) and ocular pulse amplitude (OPA) measurements. This suggests the hh-DCT is a viable alternative for clinical use.

Area of Science:

  • Ophthalmology
  • Medical Devices
  • Diagnostic Technology

Background:

  • Intraocular pressure (IOP) and ocular pulse amplitude (OPA) are critical metrics in glaucoma diagnosis and management.
  • Established devices like the slit-lamp-mounted dynamic contour tonometer (sl-DCT) provide reliable measurements but can be cumbersome.
  • A novel handheld dynamic contour tonometer (hh-DCT) has been developed to offer a more portable solution.

Purpose of the Study:

  • To compare the diagnostic accuracy of the new handheld dynamic contour tonometer (hh-DCT) against the established slit-lamp-mounted DCT (sl-DCT).
  • To evaluate agreement in intraocular pressure (IOP) and ocular pulse amplitude (OPA) measurements between the two devices.
  • To assess intraobserver variability and potential tonography effects associated with each tonometer.

Main Methods:

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  • Fifty eyes of 50 healthy volunteers were evaluated using both the hh-DCT and sl-DCT.
  • Paired t-tests and Bland-Altman analysis were employed to compare IOP and OPA measurements for bias and agreement.
  • Intraclass correlation coefficients (ICCs) were calculated to determine intraobserver variability; mixed-effects models assessed tonography effects.

Main Results:

  • No statistically significant differences were found in IOP or OPA measurements between the hh-DCT and sl-DCT.
  • Bland-Altman analysis showed a bias of 0.1 mmHg for IOP with limits of agreement from -2.71 to +2.90 mmHg.
  • ICCs for IOP (0.87 vs. 0.85) and OPA (0.86 vs. 0.87) indicated strong agreement and comparable intraobserver variability for both devices.

Conclusions:

  • The handheld dynamic contour tonometer (hh-DCT) demonstrates strong concordance with the slit-lamp-mounted DCT (sl-DCT) for IOP and OPA measurements.
  • The hh-DCT exhibits comparable accuracy and reliability to the sl-DCT.
  • The hh-DCT presents a valuable and potentially more convenient alternative for IOP and OPA assessment in clinical settings.