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Evaluation of Corneal Deformation Parameters Provided by the Corvis ST Tonometer After Trabeculectomy

Evaluation of Corneal Deformation Parameters Provided by the Corvis ST Tonometer After Trabeculectomy

Authors :
Xiangmei Kong
Zhixuan Fu
Yuan Zong
Na Wu
Source :
Journal of Glaucoma. 26:166-172
Publication Year :
2017
Publisher :
Ovid Technologies (Wolters Kluwer Health), 2017.

Abstract

Purpose The aims of this study were to evaluate how the corneal deformation parameters provided by the Corvis ST tonometer (CST) were influenced by pressure-lowering ocular surgery, and to determine the correlations of intraocular pressure (IOP) and axial length (AL) with CST corneal deformation parameters. Methods This prospective 1-month study enrolled 22 subjects (22 eyes) who underwent trabeculectomy combined with mitomycin C. The corneal deformation parameters were measured using the CST. IOP was measured before and after surgery by a Goldmann applanation tonometer and the CST. The central corneal thickness and AL were also recorded. The correlations of the corneal deformation parameters with central corneal thickness, AL, and IOP changes were determined by linear regression analysis. Results IOP decreased significantly after surgery. AL was significantly shorter at 1 week after surgery. There were significant changes in the CST parameters time 1, velocity 1, velocity 2, peak distance highest concavity, and deformation amplitude highest concavity at 1 week and 1 month after surgery and in time highest concavity at 1 week after surgery. The change in time 1 was significantly correlated with preoperative IOP and the IOP reductions, and was positively correlated with the decrease in AL at 1 week. The increase in velocity 1 was negatively correlated with preoperative IOP, and IOP reductions. The change in time highest concavity was negatively correlated with IOP before surgery and the decrease in IOP at 1 week. Conclusion CST is a good choice for measuring IOP, especially when aiming for normalization of IOP after glaucoma surgery.

Details

ISSN :
10570829
Volume :
26
Database :
OpenAIRE
Journal :
Journal of Glaucoma
Accession number :
edsair.doi.dedup.....bb81b0ad6c69375086beb17924ef8d0c
Full Text :
https://doi.org/10.1097/ijg.0000000000000590