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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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How Often the Goldmann Applanation Tonometer Should be Checked for Calibration Error?

Nikhil S Choudhari1, Harsha L Rao, Suresh Ramavath

  • 1*VST Glaucoma Center, Dr. Kallam Anji Reddy Campus, L.V. Prasad Eye Institute, Hyderabad †GMR Varalakshmi Campus, L.V. Prasad Eye Institute, Visakhapatnam, Andhra Pradesh ‡L.V. Prasad Eye Institute, Bhubaneswar, Odisha, India.

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Summary

Calibration error (CE) is more common in older Goldmann applanation tonometers (GATs). Regular monthly checks are recommended for GATs older than one year to ensure accuracy in ophthalmic measurements.

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Area of Science:

  • Ophthalmology
  • Medical Device Calibration
  • Quality Control in Healthcare

Background:

  • Goldmann applanation tonometers (GATs) are crucial for measuring intraocular pressure.
  • Ensuring the accuracy of GAT readings requires regular calibration checks.
  • Calibration errors (CE) can lead to misdiagnosis and inappropriate treatment of eye conditions.

Purpose of the Study:

  • To determine the frequency of calibration error (CE) in Goldmann applanation tonometers (GATs).
  • To assess the impact of tonometer age on the occurrence of calibration errors.
  • To establish optimal calibration check intervals for GATs based on their age.

Main Methods:

  • Seventy-six slit-lamp mounted GATs were categorized into three age groups: ≤1 year, >1 to 10 years, and >10 years.
  • Tonometers were initially checked for CE, with faulty devices repaired.
  • Calibration error checks were conducted monthly for six months on all GATs.

Main Results:

  • Seven percent of tonometers exhibited faulty calibration at baseline.
  • The incidence of unacceptable CE significantly increased with tonometer age (P<0.01).
  • Tonometer age, not frequency of use, was associated with the development of calibration errors.

Conclusions:

  • Older Goldmann applanation tonometers are more prone to calibration errors.
  • GATs exceeding one year of age require at least monthly calibration checks.
  • Newer GATs (<1 year old) may require less frequent checks, potentially twice yearly.