The comparison of corneal higher-order aberration and surgically induced astigmatism between the clear corneal incision and the limbus tunnel incision of posterior chamber implantable collame lens implantation

Abstract

Abstract Background: This study aimed to compare the corneal high-order aberration and surgically induced astigmatism between the clear corneal incision and limbus tunnel incision of posterior chamber implantable collame lens (ICL/TICL) implantation. Methods : 127 eyes of 73 myopic patients underwent ICL-V4c implantation, 70 eyes underwent clear corneal incisions, and 57 eyes were limbus tunnel incisions. The anterior and back corneal surface of RMS of all higher-order aberration (HOA RMS), spherical aberration(Z40 ), coma coefficients (Coma RMS) Z3-1 Z31, and surgically induced astigmatism (SIA) were collected at preoperative and postoperative one day, one week, and 1, 3, and 6 months. The corneal higher-order aberration was estimated as the Zernike coefficient calculated up to fifth order at a maximum diameter of 6.5 mm using Pentacam. Results: After the operation for one week, the corneal back Z31 of the clear corneal incision group was 0.06±0.06 compared to 0.05±0.06 of the limbus tunnel incision group(p=0.031). The corneal back Z40 of the clear corneal incision group was -0.02±0.25 compared to -0.04±0.21 of the limbus tunnel incision group(p=0.01). After the operation one month, the corneal back SIA of the clear corneal incision group was 0.11±0.11 compared to 0.08±0.11of the limbus tunnel incision group (p=0.013), the total corneal SIA of the clear corneal incision group was 0.33±0.3 compared to 0.15±0.16 of the limbus tunnel incision group(p=0.004), the corneal incision has more back astigmatism and total SIA than the limbus tunnel incision in post-operation one month. At post-operation six months, there are no significant differences between the two groups in Z31, Z40 , and other HOA data. The total SIA of the corneal incision group and the limbus tunnel incision group were (0.24±0.14, 0.33± 0.32, p=0.393); there is no significant difference between the two groups after the operation of six months. Conclusion: Our data showed that at 6m after ICL-V4c implantation, the high-order aberration and SIA have no significant difference using clear corneal and limbus tunnel incisions.