PURPOSE.We assessed the optical quality and intraocular scattering after posterior chamber phakic intraocular lens implantation.METHODS. We examined prospectively 38 eyes of 19 consecutive patients undergoing implantable contact lens (ICL) implantation (mean age 6 SD 36.3 6 5.7 years), and 38 age-matched normal eyes of 19 healthy volunteers (mean age 36.4 6 4.9 years). We assessed quantitatively the values of modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI), and the Optical Quality Analysis System (OQAS) values (OVs). We compared these variables in eyes undergoing ICL implantation to those in healthy eyes.
RESULTS.The mean MTF cutoff frequency, Strehl ratio, OSI, OV 100%, OV 20%, and OV 9% were 28.69 6 8.59 cycles/degree, 0.17 6 0.04, 1.06 6 0.48, 0.96 6 0.29, 0.83 6 0.31, and 0.83 6 0.32, respectively, 3 months after ICL implantation. We found no significant differences in the MTF cutoff frequency (Mann Whitney U test, P ¼ 0.31), Strehl ratio (P ¼ 0.46), OSI (P ¼ 0.30), or OVs at contrasts of 100% (P ¼ 0.51), 20% (P ¼ 0.46), and 9% (P ¼ 0.36), between the ICL and control groups.CONCLUSIONS. The optical quality parameters, such as the MTF cutoff frequency, Strehl ratio, OSI, or OVs in the ICL group, were not significantly different from those in the control group, suggesting that the optical quality and intraocular scattering of eyes undergoing ICL implantation essentially was equivalent to those of healthy eyes. (Invest Ophthalmol Vis Sci. 2012;53:3161-3166) DOI:10.1167/iovs.12-9650 T he Visian Implantable Collamer Lens (ICL, STAAR Surgical, Nidau, Switzerland), a posterior chamber phakic intraocular lens (IOL), has been reported to be effective for the correction of moderate to high ametropia. [1][2][3][4][5][6][7][8][9][10] In addition, this surgical procedure largely is reversible and, unlike laser in situ keratomileusis (LASIK), allows the lens to be exchanged even when unexpected refractive changes occur after surgery.Recently, toric ICL also has been demonstrated to be effective for the correction of high myopic astigmatism.
11-14The Optical Quality Analysis System (OQAS, Visiometrics, Terrassa, Spain), which is designed on the basis of the asymmetric pattern of the double-pass technique, 15,16 with different entrance and exit pupil sizes, enabling the detection of both symmetric and asymmetric aberrations, is the only currently available instrument used for objective measurement of optical quality in a clinical setting. 17 In addition to optical quality measurements, the system also provides an objective estimation of intraocular scattering. 18 This system allows direct objective measurement of the effect of optimal aberrations and the loss of ocular transparency on the optical quality of the human eye. Since the effectiveness of ICL implantation has been improved in recent years, it has an important role in differentiating refractive outcomes for this surgery in quantitative characterization of the optical quality of the eye. However, to our knowledge, ...