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Related Experiment Videos

Tonometry comparison: Goldmann versus Tono-Pen.

K S Kooner1, J C Cooksey, J B Barron

  • 1Department of Ophthalmology, Louisiana State Medical Center, Shreveport.

Annals of Ophthalmology
|January 1, 1992
PubMed
Summary
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The Tono-Pen shows unreliable intraocular pressure readings above 15mmHg in healthy eyes, questioning its use as a screening tool. However, it may be cautiously used in postoperative patients.

Area of Science:

  • Ophthalmology
  • Ophthalmic devices
  • Intraocular pressure measurement

Background:

  • Accurate intraocular pressure (IOP) measurement is critical for diagnosing and managing glaucoma.
  • The Goldmann applanation tonometer is the gold standard, but newer devices like the Tono-Pen offer portability and ease of use.
  • Understanding the comparative accuracy of these devices is essential for clinical practice.

Purpose of the Study:

  • To compare the accuracy of the Tono-Pen and Goldmann applanation tonometer in measuring intraocular pressure.
  • To evaluate the Tono-Pen's reliability as a screening instrument in healthy individuals and its utility in postoperative patients.

Main Methods:

  • A comparative study involving 152 eyes of healthy subjects (Group A) and 69 eyes of patients post-intraocular procedures (Group B).

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  • Intraocular pressure was measured using both Tono-Pen and Goldmann tonometers in all subjects.
  • Statistical analysis was performed to compare readings and assess correlation.

    • Main Results:

    • In healthy eyes (Group A), Tono-Pen and Goldmann tonometer readings showed no significant difference between 0-15mmHg.
    • Tono-Pen readings were significantly lower than Goldmann tonometer readings in the 16-30mmHg range (P < .0001) in Group A.
    • An acceptable correlation (r = .89) was found between the two instruments in postoperative patients (Group B).

    Conclusions:

    • The Tono-Pen's reliability is questionable for screening intraocular pressure in healthy individuals, particularly at higher pressure ranges.
    • The Tono-Pen may be cautiously utilized for monitoring intraocular pressure in patients following intraocular procedures.
    • Further research may be warranted to refine the Tono-Pen's accuracy and clinical application.