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Related Experiment Videos

Dynamic contour tonometry (DCT) versus non-contact tonometry (NCT): a comparison study.

H Burvenich1, E Burvenich, C Vincent

  • 1Dienst Oftalmologie AZ Maria Middelares Sint Jozef Gent. Drhburvenich@telenet.be

Bulletin De La Societe Belge D'Ophtalmologie
|January 21, 2006
PubMed
Summary

Non-Contact Tonometer (NCT) measurements correlate linearly with Central Corneal Thickness (CCT), unlike Pascal Dynamic Contour Tonometer (DCT) measurements. LASIK surgery impacts NCT but not DCT readings.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optometry

Background:

  • Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Accurate IOP assessment can be influenced by corneal properties, particularly Central Corneal Thickness (CCT).
  • Different tonometry methods exist, each with potential advantages and limitations regarding corneal influence.

Purpose of the Study:

  • To compare the relationship between Central Corneal Thickness (CCT) and intraocular pressure (IOP) measurements obtained by Non-Contact Tonometer (NCT) and Pascal Dynamic Contour Tonometer (DCT).
  • To evaluate the impact of LASIK surgery on IOP measurements from both NCT and DCT.
  • To determine the reliability of NCT and DCT in assessing IOP in eyes with varying CCT and after refractive surgery.

Main Methods:

Related Experiment Videos

  • Prospective study involving 294 emmetropic or ametropic eyes.
  • Measurement of IOP using NCT and DCT, and CCT using contact pachymetry.
  • Repeat measurements before and 6 weeks after LASIK surgery in 58 myopic eyes.

Main Results:

  • A significant linear correlation was found between NCT and CCT.
  • No linear correlation was observed between DCT and CCT.
  • LASIK intervention significantly affected NCT readings but did not influence DCT readings.

Conclusions:

  • NCT measurements are linearly influenced by Central Corneal Thickness (CCT).
  • Pascal Dynamic Contour Tonometer (DCT) provides IOP measurements that are independent of CCT.
  • DCT may offer a more reliable IOP assessment in eyes undergoing or having undergone refractive surgery like LASIK.