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Related Experiment Videos

Noncontact tonometry through soft contact lenses.

C W McMonnies

    American Journal of Optometry and Physiological Optics
    |December 1, 1986
    PubMed
    Summary

    Measuring intraocular pressure (IOP) with soft contact lenses is feasible using a noncontact tonometer (NCT). Reliable IOP readings are possible with lens center thickness under 0.15 mm, crucial for glaucoma screening.

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering

    Background:

    • Intraocular pressure (IOP) measurement is critical for diagnosing and monitoring eye conditions like glaucoma.
    • Current methods may require contact lens removal, posing inconvenience or risk.
    • Noncontact tonometry (NCT) offers a non-invasive approach to IOP measurement.

    Purpose of the Study:

    • To evaluate the accuracy of IOP measurements using NCT with soft contact lenses in place.
    • To determine the influence of various soft contact lens parameters on IOP readings.
    • To establish guidelines for reliable IOP assessment with contact lenses for clinical use.

    Main Methods:

    • Comparative study of IOP measurements using NCT with and without soft contact lenses.
    • Systematic examination of lens parameters: water content, design, power, manufacturing method, and center thickness.
    • Analysis of data to identify key factors influencing IOP measurement accuracy.

    Main Results:

    • Soft contact lens center thickness was the most significant factor affecting IOP measurements.
    • Reliable and valid IOP measurements were obtained with NCT when lens center thickness was less than 0.15 mm.
    • Thicker lenses (>0.15 mm) yielded convenient but less specific results for glaucoma screening.

    Conclusions:

    • Noncontact tonometry can provide accurate IOP measurements with soft contact lenses, provided lens center thickness is minimal (<0.15 mm).
    • Careful consideration of lens parameters, especially center thickness, is essential for accurate IOP assessment.
    • While thicker lenses may offer convenience in glaucoma screening, they reduce specificity, requiring careful interpretation.

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