Pachymetry is a process during the comprehensive eye examination to test for glaucoma. Before the process, your eyes are numbed. The doctor uses an ultrasonic wave instrument to compare thickness to high pressure to measure the thickness of your corneas. It is important to measure the thickness of the corneas because some thick corneas can produce an incorrect high reading on an eye pressure test.
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Honor Society of Nursing (STTI) answered
Currently, the word pachymetry is synonymous with measuring the thickness of the cornea. This is important in the evaluation of a cornea for LASIK and, incidentally, glaucoma. The process of pachymetry is painless and easy. It is performed by instruments that use one of two different methods. One instrument uses ultrasound techniques, and the other uses confocal microscopy techniques. Older methods included those that were non-contact (with the cornea) and used strictly optical methods.