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[Tonometry with a new non-contact tonometer].

G Langmann1, G Schuhmann, A Langmann

  • 1Universitäts-Augenklinik Graz.

Klinische Monatsblatter Fur Augenheilkunde
|November 1, 1990
PubMed
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This study compared the Goldmann Applanation Tonometer (GAT) and Keeler Non Contact Tonometer (NCT) for glaucoma patients. The Keeler NCT showed conformity for lower pressures but exceeded values for higher intraocular pressures.

Area of Science:

  • Ophthalmology
  • Medical Devices
  • Glaucoma Diagnosis

Background:

  • Intraocular pressure (IOP) measurement is crucial for glaucoma diagnosis and management.
  • Goldmann Applanation Tonometer (GAT) is a standard but invasive method.
  • Non-Contact Tonometers (NCTs) offer a less invasive alternative for IOP assessment.

Purpose of the Study:

  • To compare the accuracy and reliability of the Keeler Non Contact Tonometer (NCT) against the Goldmann Applanation Tonometer (GAT).
  • To evaluate the performance of the Keeler NCT in measuring intraocular pressure (IOP) in healthy individuals and glaucoma patients across different pressure ranges.

Main Methods:

  • Comparative measurement study involving 100 healthy participants and glaucoma patients.
  • Utilized both Goldmann Applanation Tonometer (GAT) and Keeler Non Contact Tonometer (NCT) for IOP readings.

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  • Compared three NCT measurements against four GAT measurements for each participant.

    • Main Results:

    • Noticeable conformity in mean intraocular pressure (IOP) values between GAT and Keeler NCT for Group I (IOP < 23 mm Hg).
    • The Keeler NCT demonstrated a high standard deviation in Group I, indicating variability.
    • In Group II (IOP ≥ 23 mm Hg), the Keeler NCT readings exceeded the nominal values obtained by GAT.

    Conclusions:

    • The Keeler NCT shows potential for IOP measurement in glaucoma assessment, particularly for lower pressure ranges.
    • Further refinement is needed to address the high standard deviation observed with the Keeler NCT in lower IOP ranges.
    • The Keeler NCT requires further investigation for accurate IOP assessment in patients with higher intraocular pressures characteristic of advanced glaucoma.