Optical And Visual Outcomes Of A New Refractive Extended Depth Of Field Intraocular Lens.

To characterize the optical design and analyse the optical quality and halo induced by the new extended depth of field TECNIS PureSee TM intraocular lens (IOL), and to evaluate its clinical performance. 

Instituto Universitario Fernández-Vega. Oviedo. Spain.

The power profile of TECNIS PureSee TM was measured with the NIMO TR1504 device. The through-focus Modulation Transfer Function area (TF-MTFa) metric from +2.00 to -4.00D and the halo induced by the IOL in the best focus plane for distance vision (0.00D), were assessed for 2.0-, 3.0- and 4.5-mm apertures diameters at the IOL plane. The clinical evaluation in a cohort of patients included postoperative refraction, visual acuities, defocus curve and subjective symptomatology. 

The power profile shows distinct zones that meet relatively smoothly. The largest power change occurs in the central zone of the lens. The TF-MTFa curves showed an increase in depth of focus for smaller pupils. Larger pupils resulted in smaller, lower- intensity halos. For 2.0-, 3.0-, and 4.5-mm pupils, halo sizes were 18.64, 14.73, and 13.23 arcmin, respectively, and normalized energies were 0.55, 0.46, and 0.42, respectively. Clinical assessment yielded excellent visual and refractive outcomes, a depth of field from +1.0 to -2.0D with visual acuities better than 0.2 logMAR, along with practically absence of dysphotopic symptoms. 

TECNIS PureSee TM IOL provided good distance optical and visual quality, and an extended depth of field of approximately 2.00 D. The depth of focus increased for smaller pupils. The halo induced by the lens was of low size and energy.