Title | The accuracy of applanation tonometry and dynamic contour tonometry: a comparison in LASIK patients |
Abstract Nr. | A2047 |
Purpose | To assess the performance of the PASCAL Dynamic Contour Tonometer (DCT) by comparing it with the Non Contact Tonometer (NCT) in Lasik patients ( myopic and hyperopic) before and 6 weeks after the intervention. Lasik changes not only the CCT but also the hysteresis of the cornea. |
Methods | In a private practice intra ocular pressure was measured in 100 eyes before and 6 weeks after lasik using NCT and DCT. Central corneal thickness was also measured on the same moment using an electronic contact pachymeter. |
Results | After myopic lasik the reduction in CCT ranged from -10 to - 185 micron ( median - 87 micron). The NCT dropped from -1 to - 10 mm Hg ( median - 6 mm Hg). The DCT changed from -4 to +5 mm Hg ( median -0.5 ).The observed drop in NCT was not directly proportional to the change in CCT. The preoperative and postoperative DCT measurements did not differ significantly. |
Conclusion | Structure of the cornea appears to influence NCT measurement but not DCT measurement. DCT suits better than NCT for monitoring IOP in post lasik eyes. |
Last name | BURVENICH |
Initials | H |
City | Merelbeke |