Recovery of anterior corneal biometry after discontinuation of orthokeratology / 眼科新进展

ABSTRACT

Objectivc To observe the short-term changes of anterior corneal biometry after discontinuation of orthokeratology in patients with 2-year wearing.Methods Retrospective study.Sixty myopic patients aged from 8-14 years old during October 2012 and October 2014 were wearing orthokeratology for 2 years in Tianjin Medical University Eye Hospital.According to the degree of myopia,they are divided into three groups(SE≤-2.00 D for group A,-2.00 D ＜ SE ≤-4.00 D for group B and -4.00 D ＜ SE ≤-6.00 D for group C).The recovery of anterior corneal curvature,including flat K(FK),steep K(SK),average K (AVEK),changes of axial length and central corneal thickness (CCT) at 1 week,2 weeks,1 month after discontinuation of orthokeratology were observed.Results There was no statistical differences in FK,SK,AVEK before and 2 weeks after wearing orthokeratology in group A (all P ＞ 0.05).While in group B,there was no significant difference in FK,SK,AVEK before and 1 month after wearing orthokeratology;There were statistically differences in FK,SK,AVEK at 1 month after discontinuation in group C compared with the baseline (all P ＜0.05).As for CCT,there was no statistical differences among group A,B,C after discontinuation of orthokeratology for 2 weeks (all P ＞ 0.05).There were statistical differences in the axial length between 1 week and 2 weeks after discontinuation of orthokeratology in group B and C (all P ＜ 0.05);There were statistical differences in the axial length between 1 month and 2 weeks after discontinuation of orthokeratology in three groups (all P ＜ 0.05);Compared with the state before wearing orthokeratology,the increase of axial length in group A,B,C were (0.43 ± 0.36) mm,(0.35 ± 0.21)mm and (0.36 ± 0.29) ram,respectively.Conclusion The time course of returning to the original corneal parameter varies among different degree of myopia,and the axial length has no significant growth after short-term discontinuation.