But there are few reports about reducing pre-existing corneal astigmatism by LRI in ICL surgery. It can effectively reduce astigmatism up to 3.0 D and result in a rapid visual rehabilitation. LRI is a safe and an inexpensive procedure, which is simple for experts to perform. The limbal relaxing incisions (LRIs) technique involves the placement of incisions corresponding to the steep meridian, resulting in corneal flattening and the reduction of astigmatic power. One popular approach to correct corneal astigmatism simultaneously to cataract surgery is to treat pre-existing astigmatism by creating limbal relaxing incisions (LRIs). Therefore, corneal astigmatism is an issue of major concern in modern refractive surgery.ĭifferent techniques are available to correct astigmatism, such as arcuate keratotomy, limbal relaxing incisions, laser vision correction, and Toric Implantable Collamer Lens (TICL) implantation.
Astigmatism(>0.75D) may cause asthenopia, blurring of vision, double images and decreased vision. At least 15% to 29% of population has 1.5 diopters (D) or more of corneal astigmatism at preoperative evaluation, the proporation of which may be higher in high myopia. The Visian Implantable Collamer Lens (ICL) (STAAR Surgical Co.), a posterior chamber phakic intraocular lens (PIOL), has been reported to perform well for the correction of moderate to high ametropia. There was no intraoperative and postoperative ocular or systemic complication. No difference was observed in the postoperative endothelial cell count between the two groups. The mean correction index (CI) was less than 1, which indicated undercorrection effect of limbal relaxing incision. The difference in SIA between the LRI and the control group was statistically significant by the end of the 1st, the 3rd, the 6th and the 12th month postoperatively ( P < 0.001).
The mean magnitude of the surgically induced astigmatism (SIA) read 1.10 ± 0.35 D,1.13 ± 0.34D,1.13 ± 0.34D,1.11 ± 0.35D by the end of the 1st, the 3rd, the 6th and the 12th month postoperatively in LRIs group, which was slightly lower than the target-induced astigmatism (TIA). The LRIs group showed significant reduction in the mean topographic astigmatism from 1.48 ± 0.35 D preoperatively to 0.37 ± 0.14 D postoperatively ( P 0.05).
At the end of the follow-up period, the UCVA was statistically better for the patients with LRIs compared with those underwent ICL surgery alone. The mean uncorrected distance visual acuity (UDVA) and the best corrected visual acuity (BCVA) demonstrated statistically significant improvement after surgery in both groups.
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