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.
ABSTRACT
Objective To investigate the residual astigmatism and surgically induced astigmatism (SIA) after implantation of Acrysof Toric intraocular lens (IOL).Methods Totally 52 patients (62 eyes) who underwent phacoemuisification with Acrysof Toric IOL implantation from February 2016 to June 2017 were retrospectively reviewed.Observation of the variables including the uncorrected visual acuity,best corrected visual acuity,refraction,corneal curvature was performed,and individual SIA,mean SIA plus centroid SIA were calculated before surgery and one month after surgery.Results There was significant difference between postoperative anticipated astigmatism and postoperative actual astigmatism [(0.17 ± 0.15) D vs.(0.492 ± 0.37) D] (P ＜ 0.05).Preoperative corneal astigmatism was (1.94 ± 0.75) D,ranging from 0.93 D to 3.70 D,and postoperative corneal astigmatism was (1.95 ± 0.80) D,ranging from 0.68 D to 3.80 D.The individual SIA was 0.08-1.39 (0.44 ± 0.25) D,the mean SIA of 0.44 D,and centroid SIA of 0.12 D@126°.Conclusion It is precise and stable for Barrett Toric formula and centroid SIA to calculate the degree of Toric IOL,but there is still residual astigmatism after IOL implantation,so further optimization of SIA is still needed.
ABSTRACT
We describe two cases in which a forceps imprintdeveloped in the AcrySof ReSTOR IOL optic whileinserting these IOLs into the cartridge with straightclamping forceps. In case 1 ,the AcrySof ReSTOR IOL wasexplanted and observed under scanning electronmicroscopy (SEM). The SEM showed that the stepdesign of ReSTOR Multifocal IOL was well maintained. Incase 2, visual acuity, contrast sensitivity and wavefrontmeasurements were performed and no specific changeswere found. Strong evidence does not exist that suggeststhe on-axis forceps imprint can significantly compromisevisual acuity.