What question did this study set out to answer?

To evaluate the accuracy of intraocular pressure measurements using noncontact tonometry with soft contact lenses in place.

March 21, 2026

Noncontact Tonometry through Soft Contact Lenses

Key Points

To evaluate the accuracy of intraocular pressure measurements using noncontact tonometry with soft contact lenses in place.
Compared IOP measurements with a noncontact tonometer with and without soft contact lenses.
Examined the effects of different lens water content, design, power, and manufacturing methods.
Focused on the impact of lens center thickness on measurement accuracy.
Reliable IOP findings were obtained with soft contact lenses when center thickness was less than 0.15 mm.
Measurements with lenses thicker than 0.15 mm were convenient but showed increased sensitivity and reduced specificity.

Abstract

ABSTRACT Under some circumstances it is advantageous to measure intraocular pressure (IOP) without removing soft contact lenses. In this study comparisons have been made between IOP measurements using a noncontact tonometer (NCT) with and without soft contact lenses on the eye. The influence of lenses of different water content, lens design, lens power, method of manufacture, and lens center thickness was examined. The most important parameter affecting the results was center thickness. It was shown that reliable and valid IOP findings can be obtained using a NCT with soft lenses on the eye when center thickness is less than 0.15 mm. In glaucoma screening readings obtained with lenses thicker than 0.15 mm may be convenient and useful al‐though such results would be achieved with increased sensitivity and concomitant reduced specificity.

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