Surgically Induced Astigmatism After Cataract Surgery With Different Wound Sizes
Narrative Responses:
Purpose
To compare surgically induced astigmatism (SIA) following co-axial cataract surgery through a 1.8 mm, 2.2 mm and 3.0 mm clear corneal wound.
Methods
Prospective comparative interventional case series. 144 eyes undergoing cataract surgery were randomly allocated into three groups based on the size of the CCI. Group one (n= 50) underwent cataract surgery through a 1.8 mm wound while group two (n= 50) and group three (n= 44) through a 2.2 mm and 3.0 mm respectively. All subjects underwent preoperative biometry with IOL master (version 5.4) and had intraocular lens (IOL) placed in the capsular bag with a customized injector designed to deliver the IOL through a 1.8 mm CCI. Keratometry was repeated four weeks postoperatively. SIA was calculated using EyePro (version 1.3).
Results
There were no intraoperative or postoperative complications. Mean SIA was 0.25D ± 0.21D, 0.24D ± 0.23D and 0.37D ± 0.31D in the 1.8 mm, 2.2 mm, and 3.0 mm group respectively. The SIA between the 1.8 mm and 2.2 mm groups were found to be statistically significant less when compared to the 3.0 mm group (p=0.02).
Conclusion
Implantation of an IOL through a 1.8 mm incision was found to be safe and induced smaller amounts of SIA when compared to cataract surgery performed through a 3.0 mm wound. This information may help the surgeon when customizing a toric IOL.