Vector analysis and comparison of surgically induced astigmatism after coaxial phacoemulsification with 2.2-and 2.8-mm clear corneal incisions
10.13389/j.cnki.rao.2018.0104
- VernacularTitle:2.8 mm与2.2 mm透明角膜切口术源性散光的矢量分析与比较
- Author:
Zheng WANG
1
;
Ying-Feng HU
;
Yan WANG
;
Rong ZHANG
;
Zhao GUAN
;
Xiang-Yu YE
Author Information
1. 福州市第二医院眼科
- Keywords:
surgically induced astigmatism;
clear corneal incisions;
centroid SIA;
mean SIA
- From:
Recent Advances in Ophthalmology
2018;38(5):448-451,456
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the surgically induced astigmatism (SIA)caused by coaxial phacoemuisification and intraocular lens (IOL) implantation with different clear corneal incision.Methods Clinical data of 97 patients 97 eyes underwent phacoemulsification and IOL implantation with 2.2 mm (2.2 mm group,44 eyes) or 2.8mm (2.8 mm group,53 eyes) clear corneal incisions were retrospectively reviewed.The corneal curvature were measured before and four weeks after the surgery.Then SIA were calculated,followed by analysis of the differences in mean SIA and centroid SIA between the 2.2 mm and 2.8 mm groups.Results At 4 weeks after surgery,the centroid and mean SIA of the 2.8 mm group was (0.234 ± 0.423) D@105° and (0.552 ±0.349) D,respectively;the corresponding data was (0.174 ± 0.464) D@104° and (0.582 ±0.392) D in the right eyes,and (0.272 ±0.382)D@106° and (0.545 ±0.300) D in the left eyes,respectively.At 4 weeks after surgery,the centroid and mean SIA of the 2.2 mm group was (0.108 ±0.417)D@98°and (0.506 ±0.362) D,respectively;the corresponding data was (0.145 ±0.404)D@81° and (0.5182 ±0.332)D in the right eyes,and (0.127 ± 0.418) D@120° and (0.516 ± 0.418) D in the left eyes,respectively.There was no significant difference in centroid SIA and mean SIA,centroid SIA and mean SIA of the right and left eyes,as well as both eyes between the two groups (all P＞0.05);Atotal of 47 patients (48.5％) had SIA greater than 0.5 D,and 28 patients (52.8％) were in the 2.8 mm groups,including 12 patients (22.6％) in the right eyes and 16 patients (20.5％) in the left eyes;as well as 19 patients (43.2％) in the 2.2 mm group,including 10 patients (22.7％) in the right eyes and 9 patients (20.5％) in the left eyes.There was no significant difference in the proportion of SIA greater than 0.5 D and the proportion of SIA between the left and right eyes greater than 0.5 D between the two groups (all P ＞ 0.05).Conclusion The mean SIA and centroid SIA are not statistically different in the 2.2 mm group than in the 2.8 mm group,but SIA were more stable in the 2.2 mm group than in the 2.8 mm group.The axis of the SIA were closely related to the position of the incisions,which were the vertical direction of the incisions.
