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Related Experiment Videos

Improved illumination for the Perkins applanation tonometer.

Thomas Ressiniotis1, Sabah M Zeki, Michael P Clarke

  • 1Department of Ophthalmology, Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, UK. tomres@doctors.org.uk

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|November 19, 2003
PubMed
Summary

A new 470 nm blue light source may enhance Perkins tonometer measurements, potentially making intraocular pressure (IOP) assessments faster and more convenient, especially in bright conditions.

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Area of Science:

  • Ophthalmology
  • Ophthalmic instrumentation
  • Tonometry

Background:

  • Perkins tonometer is a handheld device for measuring intraocular pressure (IOP).
  • Accurate IOP measurement is crucial for diagnosing and managing glaucoma.
  • Standard illumination sources can be affected by ambient room light conditions.

Purpose of the Study:

  • To evaluate the impact of an augmented, monochromatic solid-state light source (470 nm wavelength) on Perkins tonometer performance.
  • To assess potential improvements in IOP measurement accuracy and speed.

Main Methods:

  • Prospective study involving 44 patients and two independent ophthalmologists.
  • Intraocular pressure (IOP) was measured using both the standard Perkins tonometer and the modified instrument with augmented illumination.

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  • Three consecutive IOP measurements were taken for each eye, and measurement time was recorded.

    • Main Results:

    • One observer recorded statistically significantly higher IOP values with the augmented light source (+0.59 mmHg).
    • The other observer showed no significant difference in IOP measurements (-0.22 mmHg).
    • Measurement times were significantly shorter with the augmented light source for both observers.

    Conclusions:

    • The 470 nm monochromatic blue light source may improve Perkins tonometer performance.
    • Enhanced illumination can lead to faster and more convenient IOP measurements.
    • This modification shows promise for use under bright room conditions.