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Related Experiment Videos

Should Orbscan pachometry be performed before or after Goldmann applanation tonometry?

Ronnie Y C Huang1, Andrew K C Lam, Rufina Chan

  • 1Department of Optometry and Radiography, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|August 17, 2005
PubMed
Summary

Goldmann applanation tonometry does not alter central corneal thickness (CCT) measurements obtained with Orbscan. This finding indicates that Orbscan CCT measurements for intraocular pressure (IOP) adjustment can be performed before or after Goldmann tonometry.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Central corneal thickness (CCT) is a significant factor influencing IOP readings.
  • The Orbscan system provides optical pachometry for CCT measurement, while Goldmann applanation tonometry is a standard method for IOP assessment.

Purpose of the Study:

  • To evaluate the impact of Goldmann applanation tonometry on Orbscan-derived central corneal thickness (CCT) values.
  • To determine if IOP measurement affects CCT readings in young, healthy adults.

Main Methods:

  • Fifty-three healthy eyes underwent Orbscan optical pachometry, followed by Goldmann applanation tonometry.
  • Orbscan pachometry was repeated after Goldmann tonometry by the same operator.

Related Experiment Videos

  • Standard Goldmann technique was employed, including topical anesthetic and fluorescein sodium.

    • Main Results:

    • The mean IOP measured was 14.6 +/- 2.6 mmHg.
    • No statistically significant difference was observed in mean CCT values before (551 +/- 32 microm) and after (552 +/- 35 microm) Goldmann tonometry (p = 0.50).

    Conclusions:

    • Standard Goldmann applanation tonometry does not significantly alter central corneal thickness measurements obtained via Orbscan.
    • Orbscan CCT measurements can be reliably performed either before or after Goldmann tonometry for accurate IOP assessment.