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First Author: A.Del Águila-Carrasco SPAIN
Co Author(s): C. Pérez-Vives D. Monsálvez-Romín T. Ferrer-Blasco R. Montés-Micó
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To evaluate and compare the optical quality of myopic and hyperopic Implantable Collamer Lenses (ICL) from its wavefront aberrations, considering several different powers and pupil diameters.
University of Valencia, Spain.
The wavefront aberrations of two myopic (-3 and -6 Diopters [D]) and two hyperopic (+3 and +6 D) Visian v4b ICLs (STAAR Surgical, Nidau, Switzerland) were measured in vitro using a Nimo TR0805 device (Lambda X, Belgium). The working principle of the NIMO instrument is based on a Phase Shifting Schlieren technique. To evaluate and compare the optical quality of different powers of ICLs, the root mean square (RMS) of total higher order aberrations (HOAs), trefoil, coma, tetrafoil, secondary astigmatism, and spherical aberration at 3- and 4.5-mm pupil was analyzed. In addition, the Point Spread Functions (PSFs) of each ICL evaluated was calculated from the wavefront aberrations at 3- and 4.5-mm pupil.
Myopic ICLs showed negative spherical aberration; on the other hand hyperopic ICLs showed positive spherical aberration. Both, positive and negative spherical aberration, raise when the ICL power is increased, due to the intrinsic optical properties of the lens, being more negative in the myopic ICLs and more positive in hyperopic ICLs. All ICLs evaluated had negligible amounts of other aberrations. We did not find statistical significant differences in any Zernike coefficient RMS values analyzed between myopic and hyperopic ICLs at 3- and 4.5-mm pupil (P>0.05).
Myopic and hyperopic ICLs provide good and comparable optical quality for low to moderate refractive error. The ICLs evaluated showed that the wavefront aberration values were clinically negligible, therefore the visual quality after implantation is not affected.