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Keratometry using the Goldmann tonometer

M C Corbett1, G A Shun-Shin, P N Awdry

  • 1Oxford Eye Hospital, UK.

Eye (London, England)
|January 1, 1993
PubMed
Summary
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Goldmann tonometer keratometry accurately guides corneal astigmatism after cataract surgery. This method reliably assesses astigmatism axis and power, aiding appropriate suture removal decisions.

Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Ophthalmic Diagnostics

Background:

  • Corneal astigmatism is a common complication after cataract surgery.
  • Accurate measurement of corneal astigmatism is crucial for visual outcomes.
  • Existing keratometry methods may have limitations in post-surgical assessments.

Purpose of the Study:

  • To evaluate the reliability of Goldmann tonometer keratometry for assessing corneal astigmatism post-cataract surgery.
  • To compare Goldmann tonometer keratometry with Javal-Schiotz Keratometry.
  • To determine the clinical utility of Goldmann tonometer keratometry in guiding post-operative management.

Main Methods:

  • Goldmann tonometer keratometry was performed by a masked observer on 71 patients 8 weeks after extracapsular cataract surgery.

Related Experiment Videos

  • Measurements included assessing the distortion of tonometer rings into ellipses to determine astigmatism axis and power.
  • Intraocular pressure differences in principal meridians were also analyzed.
  • Results were compared with Javal-Schiotz Keratometry performed by an independent observer.

    • Main Results:

    • Goldmann tonometer keratometry accurately identified corneal astigmatism in 83% of patients within 20 degrees for axis measurement.
    • The 95% confidence interval for astigmatism power was +/- 2.90 Diopters Cylinder (DC).
    • The method demonstrated potential to guide appropriate suture removal in 87% of cases.

    Conclusions:

    • Goldmann tonometer keratometry is a reliable and accessible tool for evaluating post-cataract surgery corneal astigmatism.
    • The technique provides valuable information on astigmatism axis and power.
    • This method can aid in clinical decision-making, such as suture removal timing.