Refractive laser surgery induces
substantial changes in corneal structure, causing inaccurate intraocular
pressure (IOP) readings. Pascal dynamic contour tonometry (PDCT) and I care rebound tonometer (RBT) are two novel devices that do not depend on applanationto measure IOP. Purpose of this prospective study was to compare PDCT and
rebound tonometry versus Gold man tonometry (GAT) in a group of patients who
underwent photorefractive keratectomy (PRK).
Central corneal thickness
and IOP were measured in 54 eyes before and after PRK. All IOP measurements
were taken by the same examiner, using PDCT, RBT and GAT in a randomised,
masked fashion. After excimer laser surgery, PDCT measurements were higher than GAT (p<0.0001) and RBT (p=0.0012). Multiple linear regression
analysis indicated that size of contact area was significant (b=-0.504;
p<0.0001) while corneal thickness was not (b=0.003; p=0.169).
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