Implantable collamer lens and laser in situ keratomileusis for different degrees of myopia comparison using an adaptive optics visual simulator

Poster Details

First Author: C.P SPAIN

Co Author(s):    A. Dom   L. Belda Salmer   S. Garc   R. Mont     

Abstract Details

Purpose:

To compare optical and visual quality of the Implantable Collamer Lens (ICL) and laser in situ keratomileusis (LASIK) for different degrees of low myopia (-3 and -6 Diopters (D)). We used an adaptive optics system to simulate vision from the ICL’s and LASIK’s aberration patterns themselves.

Setting:

GIO, Optics Department, Faculty of Physics, University of Valencia, Spain.

Methods:

The irx3 Hartmann-Shack wavefront aberrometer (Imagine Eyes, Orsay, France) together with a custom-made wet-cell was used to obtain the in vitro wavefront of the ICL. In order to simulate the vision of post- ICL implantation surgery in each individual, the crx1 was programmed to compensate the eye’s wavefront error and then the aberration pattern of ICLs was induced adding the wavefront pattern of the myopic eye. The same procedure was followed to simulate the vision post-LASIK surgery, but now the wavefront pattern of the LASIK was induced. We analyzed the Modulation Transfer Function (MTF), Point Spread Function (PSF) and the Strehl ratio (SR). High (100%)-, medium (50%)- and low (10%)-contrast visual acuity (VA) was measured. The contrast sensitivity (CS) was measured for 3 spatial frequencies: 10, 20 and 25 cycles/degree (cpd). Oriented sinusoidal gratings (0o, 45o, 90o and 135o) were randomly generated and displayed on the micro-display using a 4-alternative, forced-choice method. All measures were taken for 3- and 5-mm pupil.

Results:

The ICL showed a MTF near of diffraction-limited MTF, but the post-LASIK of MTF worsened moving away from both curves. Statistically significant differences were found in VA between both procedures for all conditions (p<0.05). For -3D ICL and LASIK, we did not find statistically significant differences in CS between two procedures for both pupils and any spatial frequencies (p>0.05). But for -6D ICL and LASIK the effect of aberrations became apparent, finding statistically significant differences in CS between both procedures for two pupils and all spatial frequencies evaluated (p<0.05). In all cases optical and visual quality was better with the ICL procedure.

Conclusions:

Both myopic ICL and LASIK procedures provide good optical and visual quality, although ICL provides better outcomes than LASIK surgery, specially for higher refractive errors and pupil sizes. These outcomes are due to LASIK procedure induces greater higher ocular aberrations than ICL implantation. FINANCIAL DISCLOSURE?: No