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The Pascal dynamic contour tonometer (DCT) provides reliable intraocular pressure (IOP) measurements comparable to Goldmann applanation tonometry (GAT) in normal corneas. Further comparison with intracameral manometry is recommended.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Goldmann applanation tonometry (GAT) accuracy can be affected by central corneal thickness (CCT) and corneal rigidity.
  • The Pascal dynamic contour tonometer (DCT) is a newer device designed for intraocular pressure (IOP) measurement, aiming for independence from CCT and corneal curvature.

Purpose of the Study:

  • To compare IOP measurements between DCT and GAT in eyes with normal corneas of varying thickness.

Main Methods:

  • Prospective study involving 100 subjects (100 eyes).
  • Intraocular pressure was measured using both DCT and GAT in random order.
  • Subject demographics included M:F=46:54, mean age 42+/-19 years.

Main Results:

  • Mean DCT readings were slightly higher than GAT (16+/-3 mmHg vs 15+/-3 mmHg, p=0.001).
  • Bland-Altman analysis showed a bias of -1.0 mmHg [95% CI: +/-1.2] between DCT and GAT.
  • Neither GAT nor DCT demonstrated a significant correlation with central corneal thickness (mean CCT 533+/-48 microm).

Conclusions:

  • DCT offers suitable and reliable IOP measurements in eyes with normal corneas, showing good agreement with GAT.
  • Future research should compare DCT measurements with intracameral manometry for further validation.