The purpose of this study is to compare the outcomes of cataract surgery performed with three incision-size-dependent phacoemulsification systems (1.8, 2.2 and 3.0 mm).
It is generally the case that smaller corneal cataract surgical incisions are associated with more rapid wound healing, more stable corneal biomechanical properties and less surgically induced astigmatism (SIA). With the development of phacoemulsification and foldable intraocular lenses (IOL) during recent decades, the size of clear corneal incisions has been reduced from 3.2-mm (coaxial small incision) to 1.4-mm (bimanual micro incision). Micro incision cataract surgery (MICS), including bimanual and micro coaxial phacoemulsification, has attracted much interest recently, due to its safety and ease of learning. However, the superiority of coaxial micro incision cataract surgery as compared conventional coaxial cataract surgery is still not certain, because micro incision phacoemulsification may result in longer ultrasound time (UST), the use of more ultrasonic power and consequently higher endothelial cell loss (ECL). In our previous studies of the OZil Torsional phacoemulsification system (Infinity, Alcon), we reported that the safety and effectiveness of cataract surgery are influenced by many factors, including the blade used to create the incision, the phacoemulsification apparatus, and the IOL and mode of IOL delivery, which together constitute a surgical system, whose outcomes are restricted by the best performance of each component. Today, micro coaxial phacoemulsification is in wide use for cataract surgery, but the lower limits of incision size should be understood in the context of the various components of the surgical system. In this study, we compared the safety and efficacy of three different incision-size-dependent phacoemulsification systems, 1.8, 2.2 and 3.0 mm, and evaluated the relationship between incision size and SIA.
Study Type
OBSERVATIONAL
Enrollment
120
Cataract surgery performed with three incision-size-dependent phacoemulsification systems (1.8, 2.2 and 3.0 mm)
Zhongshan Ophthalmic Center, Sun Yat-sen U
Guangzhou, Guangdong, China
Central Cornea Endothelial Cell Loss
Central cornea endothelial cell loss was calculated on the basis of preoperative and postoperative endothelial cell density.
Time frame: post-operative week 1, post-operative month 1, and post-operative month 3
Surgically Induced Astigmatism
Corneal astigmatism was measured using an eye scanner (Pentacam; Oculus, Wetzlar, Germany), and the SIA was calculated at each postoperative visit using the following equation.
Time frame: post-operative week 1, post-operative month 1, and post-operative month 3
Best-corrected Visual Acuity
The best-corrected visual acuity (BCVA) was measured, using an ETDRS chart and auto-refraction as refined by an ophthalmologist, preoperatively and at postoperative 1 day, 1 week, 1 month and 3 months.
Time frame: post-operative week 1, post-operative month 1, and post-operative month 3
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