Corneal Pachymetry – Suzanne Corcoran, COE

As you know, pachymetry is a measurement of the thickness of the cornea — usually the central cornea, although there are diseases that warrant a pachymetry grid across a wide area. Pachymetry is primarily used when a diseased cornea is edematous or ectatic, or prior to LASIK to help plan the photoablation. More recently, pachymetry has become useful in glaucoma detection. The Ocular Hypertension Treatment Study revealed that applanation tonometry of an unusually thin cornea results in a reading lower than the actual IOP because of reduced corneal resistance to indentation. Similarly, thick corneas yield false high readings. As a result, pachymetry is being used more often by physicians treating glaucoma, so that this factor is taken into account.

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