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First Author: C.Pérez-Vives SPAIN
Co Author(s): T. Ferrer-Blasco A. Domínguez-Vicent A. Del Aguila-Carrasco R. Montés-Micó
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To evaluate the changes in optical quality of the Hole Implantable Collamer lens (Hole ICL) at different degrees of decentering.
Valencia University Clinic, Spain.
Wavefront aberrations of -3, -6 and -12 diopter (D) Hole ICL were measured in three conditions, centered and decentered 0.3 and 0.6 mm, at 3- and 4.5-mm pupils. The root mean square (RMS) of total higher order aberrations, trefoil, coma, tetrafoil, secondary astigmatism, and spherical aberration were evaluated. Zernike coefficients values were retained as the average of 10 measurements. In addition, point spread function (PSF) and simulated retinal images of Hole ICLs were calculated from de wavefront aberrations for all conditions. Differences were considered statistically significant when P value was less than .05.
In the centered position, Hole ICLs showed negative values of spherical aberration, which increases with the Hole ICL refractive power, and negligible amounts of other aberrations. When the Hole ICLs were decentered, we only found statistically significant differences in coma aberration between the centered position and both degrees of decentering for all Hole ICLs and pupils evaluated (p<0.05). Coma aberration increased with Hole ICL decentration; this increment was greater for higher Hole ICL powers and pupil sizes. No statistical significant differences were found in other Zernike coefficient RMS values evaluated between centered and decentered positions for any Hole ICLs and pupils evaluated (p>0.05). Regarding to the total RMS, at 3-mm pupil, we found statistically significant differences only between centered and 0.6 mm of decentering for -12D Hole ICL (p<0.05). At 4.5-mm pupil, statistically significant differences were found between centered position and 0.6 mm decentering for all Hole ICLs evaluated (p<0.05). The PSF and retinal simulated images computed from the wavefront aberrations show minimal differences between centered and both decentered positions of all Hole ICLs evaluated.
Hole ICL decentration induces coma aberration. This effect is expected considering that a displacement of a lens with spherical aberration generates coma aberration. However, the PSFs and simulated retinal images showed low influence of coma aberration increment, since we cannot appreciate the visible differences between centered and decentered Hole ICL positions. It has been shown that the increment of coma found in our study, attributable to the Hole ICL decentering, is expected to not affect the visual quality of a patient implanted with the lens. These outcomes show that although coma aberration increased with Hole ICL decentering, these values were clinically negligible and have no effect on the visual performance.