CONTRAST SENSITIVITY AND HIGH ORDER ABERRATIONS AFTER FEMTOSECOND LASIK AND IMPLANTABLE COLLAMER LENSES IN CORRECTION OF HIGH MYOPIA

Purpose: To compare visual quality (UCVA, BCVA, and contrast sensitivity) and optical quality (High order aberrations) of Femtosecond assisted LASIK and implantable collamer lens implantation in correction of high myopia. Methods: This study was non-randomized comparative prospective consecutive interventional study. It included 31 eyes with high myopia (≥ -6 Ds) of 21 patients attended to the outpatient ophthalmic clinic of Sohag university hospitals from the period from Jan.2016 to Jan.2017. The patients were divided into two groups depending on: Degree of myopia, corneal thickness and corneal tomography. Group A (14 eyes) of 12 patients were subjected to implantable collamer lenses implantation and Group B (17 eyes) of 9 patients were subjected to femtosecond assisted LASIK. Results: Postoperative data in both groups was, in Group A (ICL group) showed UCVA was (0.188±0.123) and UCVA of Group B (Femtosecond assisted LASIK) was (0.105±0.06) with (p-value <0.133). BCVA of Group one (ICL) was (0.171±0.114) and that of Group two was (0.105±0.04) with (p-value <0.174). Spherical error in Group A was (0.321± 0,590) and that of Group B (-0.75±0.31) postoperative with (p-value <0.001*). Cylindrical error was (-0.392±0.318) and Group two was (-0.750±0.204) with (p-value <0.00*). Spherical equivalent in Group A was (-0.00±0.433) and that of Group B was (-1.12±0.748) with (p-value <0.004*). Contrast sensitivity of Group A was (132.57±39.99) and that of Group B (102.857±23.688), with (p-value <0.075). There wasn’t significant difference in RMS Group A (0.770±0.21) and that of Group B (1.15±0.53) with (p-value <0.22). There was significant difference in mean values of spherical aberrations of Group A (-0.13±0.9123), Group B (0.781±0.406) with (p-value <0.001*) , coma of Group A (0.131±0.0649), Group B (0.4600±0.2075) with (p-value <0.011*) and trefoil high order aberrations of Group A (-0.151±0.09), Group B (0.282±0.11) with (p-value <0.03* . Conclusion: Both implantable collamer lens and femtosecond assisted LASIK proved good visual quality regarding visual acuity and contrast sensitivity in photopic conditions. For optical quality both induced high order aberrations which were more in Femtosecond assisted group.