Comparative Analysis of Extended-Range IOLs

The following IOLs were included in the analysis: DFT015 (AcrySof IQ Vivity, Alcon Laboratories, Inc.) and SN60WF (AcrySof IQ; Alcon Laboratories, Inc.). The DFT015 is an extended range-of-vision IOL based on a non-diffractive technology called X-wave (X-wave EDOF) [Alcon Data on File, 2019–2020; AcrySof® IQ Vivity™ Extended Vision IOL Directions for Use. Alcon Laboratories, Inc.; 2020]. Specifically, it uses a central 2.2-mm optical zone, containing two non-diffractive transition elements changing the wavefront of the central light beams to elongate the depth of focus. The anterior surface of the IOL is also designed with negative spherical aberration to compensate for the positive spherical aberration of the cornea. The result is a continuous extended focal range with monofocal visual disturbances profile [Alcon Data on File, 2019–2020; AcrySof® IQ Vivity™ Extended Vision IOL Directions for Use. Alcon Laboratories, Inc.; 2020]. The SN60WF is an aspheric biconvex monofocal IOL, with a reported 0.20 μm of negative spherical aberration. The DFT015 and the SN60WF share the same ultraviolet and blue light filtering acrylate/methacrylate copolymer. Their optic diameter is 6 mm, and the overall length is 13 mm. Both IOLs have modified L-loop haptics, with no angulation and a square edge interrupted at the optic-haptic junction. Their refraction index is 1.55 at 35°. The IOL power range varies from + 15.0 to + 25.0 D (step 0.5 D) for the DFT015 and from + 6.0 to + 30.0 (step 0.5 D) for the SN60WF. The same power was used for all IOLs included in the analysis (+ 20D). For each model, three IOLs were consecutively tested.