First Author: A.Dom SPAIN
Co Author(s): C. P C. Albarr T. Ferrer Blasco R. Mont
Purpose:
To compare optical and visual quality after implantable collamer lens (ICL) and laser in situ keratomileusis (LASIK) for different degrees of hyperopia (+2 and +5 Diopters (D)).
Setting:
University of Valencia, Spain.
Methods:
Measures were taken for 3- and 5-mm pupil, and no mydriatic and cyclopegic eye-drop was used. Then, patients with pupil diameter less than 5-mm in dark conditions were excluded. 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. The patientsÂ’ wavefront aberrations post- hyperopic LASIK used, for high and low hyperopia, were obtained from previous studies published. To assess visual function, an adaptive optics visual simulator (crx1, Imagine Eyes, France) was used to compensate subjectsÂ’ ocular aberrations and simulate the wavefront aberration pattern of post-ICL or post-LASIK surgery. We analyzed the Modulation Transfer Function (MTF), Point Spread Function (PSF) and the Strehl ratio (SR). Visual acuity (VA) for high (100%), medium (50%), and low (10%) contrast, and contrast sensitivity (CS) at 10, 20 and 25 cycles per degree (cpd) were measured for both groups.
Results:
The ICL showed a MTF near of diffraction-limited MTF, but the post-LASIK MTF worsened moving away from both curves. VA after ICL simulation was statistically significant better (p<0.05) than VA after LASIK simulation for all contrast and both pupil sizes and hyperopia degrees. With regard to CS results, the ICL showed better outcomes (p<0.05) than hyperopic LASIK simulation, for both hyperopia degrees, pupil sizes, and all spatial frequencies. In all cases, the optical and visual quality was better with the ICL procedure.
Conclusions:
Hyperopic ICL procedure provides better outcomes than hyperopic LASIK surgery, specially for higher pupil sizes, when aberrations become more apparent. These outcomes are due to hyperopic LASIK procedure induces greater higher ocular aberrations than ICL implantation. FINANCIAL DISCLOSURE?: No
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