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First Author: C.Pérez-Vives SPAIN
Co Author(s): T. Ferrer-Blasco D. Monsálvez-Romín L. Belda-Salmerón R. Montés-Micó
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To compare the optical quality of myopic Implantable Collamer lens (ICL) with and without central hole (Hole ICL and conventional ICL). The V4c model introduces a central hole (diameter 0.36 mm) to improve the aqueous humor perfusion and reduce the risk of secondary cataract formation.
Valencia University Clinic, Spain.
The NIMO instrument was used to analyze and measure wavefront aberrations in vitro of the -3, -6 and -12 diopter (D) V4b (conventional ICL) and -3, -6 and -12D V4c ICLs (Hole-ICL). We analyzed the root mean square (RMS) of total higher aberration, trefoil, coma, tetrafoil, secondary astigmatism, and spherical aberration at 3- and 4.5-mm pupils. Zernike coefficients values were retained as the average of 10 measurements. In addition, point spread function (PSF) and simulated retinal images of ICLs were calculated from de wavefront aberrations for each ICL. Differences were considered statistically significant when P value was less than .05.
All ICLs evaluated had negative values of spherical aberration, which increases with the ICL power. We did not find statistically significant differences in spherical aberration RMS values between conventional and Hole ICL at any ICL powers and for both pupils (p>0.05). The values of other Zernike coefficients evaluated were negligible and neither statistical significant differences were found at any Zernike coefficient RMS values evaluated between both ICL models and at 3- and 4.5-mm pupils (p>0.05). Regarding to the total RMS, we did not find statistically significant differences between conventional and Hole ICLs at any refractive power and pupil diameter (p>0.05). The images of PSFs computed from the wavefront aberrations of the ICLs evaluated show minimal differences; a slightly greater spread-out can be observed at conventional and Hole -12D ICLs in relation to lower-power ICLs because of the effect of spherical aberration increment with the refractive power. In the simulated retinal images, as expected, they did not show differences between conventional and Hole ICLs for any refractive powers.
This study show that conventional and Hole ICL show similar wavefront aberrations values without differences between them at any refractive power evaluated. It has been shown that the spherical aberration increment was clinically negligible to affect the visual quality of a patient after its implantation. In addition the values of other Zernike coefficient evaluated were negligible. These outcomes show that both ICLs models have good and comparable optical quality for all ICLs power evaluated.