Goldmann Applanation, Dynamic Contour, Non-contact Tonometer를 이용한 백내장 수술 전후 각막의 변화에 따른 안압 측정 비교

Abstract

Background : To evaluate the intraocular pressure using Dynamic contour tonometer (DCT), Goldmann applanation tonometer (GAT), Non-contact tonometer (NCT) according to the changes of corneal biomechanical characteristics for patients with cataract extraction Methods : From Jan 2007 to Dec 2007, intraocular pressure was evaluated using DCT, GAT and NCT for 48 patients (55 eyes) who underwent phacoemulsification with posterior chamber IOL implantation in this period. And central corneal thickness (CCT) and corneal curvature were examined with ultrasonic pachymetry and autokeratometry. Results : Intraocular pressures using DCT, NCT and GAT were decreased at postop 1 day, and get back to preop value at postop 7 day. Corneal curvature and CCT were decreased at postop 1 day and restored at postop 7 day. DCT has no correlation with CCT and cornel curvature. Conclusions : Changes in bi1)omechanical characteristics like corneal thickness, curvature, hysteresis are able to make an error in intraocular pressure evaluation. But DCT can check the intraocular pressure without influence of central corneal thickness and corneal curvature resulted from cataract extraction. DCT is a reliable and useful method to reduce the error during IOP measurement for patients with cataract extraction.