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

Abstract

Purpose: To compare visual quality (UCVA, BCVA, and contrast sensitivity) and optical quality (Highorder aberrations) of Femtosecond assisted LASIK and implantable collamer lens implantationin correction of high myopia. Methods: This study was non-randomized comparative prospectiveconsecutive interventional study. It included 31 eyes with high myopia (≥ -6 Ds) of 21 patientsattended to the outpatient ophthalmic clinic of Sohag university hospitals from the period fromJan.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 toimplantable collamer lenses implantation and Group B (17 eyes) of 9 patients were subjected tofemtosecond assisted LASIK. Results: Postoperative data in both groups was, in Group A (ICLgroup) 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 thatof 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 errorwas (-0.392±0.318) and Group two was (-0.750±0.204) with (p-value <0.00*). Spherical equivalent inGroup A was (-0.00±0.433) and that of Group B was (-1.12±0.748) with (p-value <0.004*). Contrastsensitivity of Group A was (132.57±39.99) and that of Group B (102.857±23.688), with (p-value<0.075). There wasnit 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 sphericalaberrations of Group A (-0.13±0.9123), Group B (0.781±0.406) with (p-value <0.001*) , coma ofGroup A (0.131±0.0649), Group B (0.4600±0.2075) with (p-value <0.011*) and trefoil high orderaberrations 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 qualityregarding visual acuity and contrast sensitivity in photopic conditions. For optical quality bothinduced high order aberrations which were more in Femtosecond assisted group.