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[Evaluation of Goldmann applanation tonometer with thin membrane water manometer]
Nippon Ganka Gakkai Zasshi
|June 1, 1994
Summary
Accurate intraocular pressure measurement requires careful observation during applanation tonometry. The true applanated area is inside the dark ring, not the fluorescein ring
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optics
Context:
- Applanation tonometry is a standard method for measuring intraocular pressure (IOP).
- Goldmann-type applanation tonometry relies on the applanation of the cornea by a tonometer tip.
- Accurate IOP measurement is critical for diagnosing and managing glaucoma.
Purpose:
- To evaluate the accuracy of applanation tonometry in measuring intraocular pressure.
- To determine the precise boundary of the applanated area on the cornea.
- To identify factors influencing the accuracy of Goldmann-type applanation tonometry.
Summary:
- A thin membrane water manometer with a HEMA soft contact lens was used to measure internal pressure.
- When the fluorescein ring's inner rims contacted, measured pressure was 5-15 mmHg lower than theoretical.
- Applanating until a 0.2 mm dark ring's inner rims contacted yielded approximate theoretical and measured values.
Impact:
- The study redefines the indicator for the true applanated area in tonometry.
- Findings suggest a modification in the technique for more accurate IOP readings.
- This research can improve the diagnostic accuracy of glaucoma and other eye conditions.