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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

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Published on: March 29, 2022

Hand-held dynamic contour tonometry.

Pascal B Knecht1, Ursina Schmid, Timo Romppainen

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

Acta Ophthalmologica
|February 26, 2011
PubMed
Summary
This summary is machine-generated.

A new hand-held dynamic contour tonometer (HH-DCT) shows higher intraocular pressure (IOP) readings than established devices. However, the HH-DCT demonstrates more consistent results with lower variability, suggesting potential for improved IOP measurement.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Existing tonometry devices have varying degrees of accuracy and variability.
  • A novel hand-held dynamic contour tonometer (HH-DCT) has been developed for IOP assessment.

Purpose of the Study:

  • To introduce a prototype hand-held dynamic contour tonometer (HH-DCT).
  • To prospectively compare the IOP measurements of HH-DCT against the Perkins applanation tonometer (PAT) and TonoPenXL (TPXL).

Main Methods:

  • A prospective, single-center, randomized study was conducted.
  • Intraocular pressure (IOP) readings were obtained in random order using HH-DCT, PAT, and TPXL.
  • Intra-observer variability was assessed among three ophthalmologists and one medical student.

Main Results:

  • Ninety-two healthy participants' corneas were analyzed.
  • Mean IOP measurements were: HH-DCT 16.97 ± 2.71 mmHg, PAT 13.98 ± 2.52 mmHg, and TPXL 13.34 ± 2.68 mmHg.
  • The range of consecutive IOP readings differed significantly between devices (p < 0.001), with HH-DCT showing a lower mean range (1.45 ± 1.07 mmHg).

Conclusions:

  • HH-DCT produced significantly higher IOP readings compared to PAT and TPXL.
  • These findings align with previous studies comparing slit-lamp-mounted DCT (SL-DCT) with Goldmann Applanation Tonometry.
  • HH-DCT exhibited lower intra-observer variability, suggesting more consistent IOP measurements.