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Some tonometry readings influenced more by corneal thickness than others
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Central corneal thickness potentially influences Goldmann applanation tonometry readings, while pneumotonometry and dynamic contour tonometry readings are less strongly affected, a recent study concluded.
Christoph Kniestedt, MD, of the University of California, San Francisco, and colleagues examined 258 eyes with normal anterior segments and with or without confirmed or suspected glaucoma. Patients were assessed for central corneal thickness and then had IOP measured with Goldmann applanation tonometry, pneumotonometry and dynamic contour tonometry.
Goldmann tonometry measured lower IOPs in eyes with thinner central corneal thickness; central corneal thickness had no bearing on readings with pneumotonometry and dynamic contour tonometry, the authors said. They found a “significant correlation” between central corneal thickness and Goldmann measurements, although the readings were not linearly correlated.
The study is published in Archives of Ophthalmology.