Applied comparison between the dynamic contour tonometry and the pentacam system before and after LASIK

Abstract

Objective To compare the applicability between the dynamic contour tonometry (DCT)and the Pentacam system before and after laser in situ keratomileusis (LASIK).Methods After measured CCT and CCV by Pentacam system,65 patients ( 129 eyes) which would be treated by LASIK operation were measured lOP by the Non-contact tonometer (NCT) and DCT respectively before operation and one month after operation,Then 5 methods were used to correct the IOP which was measured by NCT,the 5 methods were Ehlers,Shah,Dresden,Orssengo/Pye and Koldhaas proposed by Pentacam system.Finally the statistical analysis were adopted to evaluate the measurement results.Results Before and after LASIK the IOP of DCT was the highest and there was no statistical difference between DCT and the method of Ehlers ( P ＞0.05 ) ; There were significant difference between the IOP corrected by other methods before and after LASIK (P ＜0.01 ),IOP in each group had positive correlation; CCT and CCV had no influences on DCT measurement value before and after LASIK ( P ＞ 0.05 ),Corrected lOP value proposed by Pentacam system inevery group had close relation to CCT and CCV.Conclusion The CCT and CCV didn't affect the measured results of DCT,and the DCT could be regarded as the most important method to measure IOP after LASIK,The method of Ehlers proposed by Pentacam is a strong complement of it. Key words: Dynamic contour tonometer; Non-contact tonometer; Pentacam analysis system; Correction of intraocular pressure