Dick et al. 1 described the 2-year safety and efficacy of the Artiflex phakic intraocular lens (pIOL) (prerelease version, Ophtec BV) and Tehrani et al. 2 described the effects of this pIOL on higher-order aberrations (HOAs). The pIOL was subsequently substantially modified before it was released commercially in its current form (Artiflex pIOL, version 401, Ophthec BV). The redesigned pIOL has an increased vault between the optic-haptic junction and the iris plane, resulting in greater apex to iris plane distance than in the prerelease version. 1 We performed a prospective study of the safety, efficacy, and effect of the newer version on HOAs, which has not been described. LogMAR corrected distance visual acuity (CDVA), uncorrected distance visual acuity (UDVA), manifest refractive spherical equivalent (MRSE), endothelial cell density (ECD), and HOAs were recorded preoperatively and 6, 12, and 24 months after implantation of the pIOL.Implantation was performed by a single surgeon (M.O.K.) in 66 myopic eyes of 37 patients (mean MRSE À8.9 diopters [D] G 1.9 [SD]). At 24 months, the mean MRSE was À0.3 D; 69.4% of eyes had a UDVA of less than or equal to 0.0 logMAR and 100% had a UDVA of less than or equal to 0.18 logMAR. Laser-assisted subepithelial keratomileusis was performed in 6% of eyes to correct a residual refractive error. Thirty-two eyes (48.5%) gained 1 or more lines of CDVA, and no eye lost a line of CDVA. A statistically significant 17% decrease in the root mean square (RMS) of vertical trefoil Z(3,À1) was noted (P Z .016, Student t test, Table 1), and there was a statistically significant 48% decrease in 4th-order spherical aberration, Z(4,0), (P Z .007, Student t test, Table 1). The total HOAs were not significantly altered after surgery (PR.194, Student t test, Table 1). The mean ECD did not change significantly from preoperatively (3245 G 364 cells/mm 2 to 2 years postoperatively (3268 G 318 cells/mm 2 ; P Z 0.68, Student t test). Six months postoperatively, 2 patients (5%) reported subjective complaints of difficulty with night driving because of monocular night glare, which improved after a short course of topical brimonidine 0.15%.The results of this study compare favorably with those described by Dick et al., 1 who reported a mean CDVA of À0.01 at 2 years; in our study, the mean CDVA at 2 years was also À0.01. The efficacy index at 6 months and 1 year reported by Dick et al. (0.99 and 1.01, respectively) compared favorably with those of our study at the same periods (1.04 and 1.07, respectively). At 6 months and 1 year, Dick et al. 1 reported that 95.5% and 96.0% of cases, respectively, were within 1.0 D of intended correction; in our study, 92% and 86% of cases, respectively, met the same criteria.We had no cases of explantation or repositioning after 2 years compared with the rates reported by Dick et al. of 0.3% and 1.4%, respectively.