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    How IOL platform designs are achieving quality of vision

    The extended range of focus of a new IOL increases patient options and satisfaction

    Take-home: Patient satisfaction is high following implant of the Symfony IOL, which is designed with an elongated focal zone in an attempt to minimise visual compromises and avoid visual dysphotopsias.

    A primary unintended consequence of lens platforms offering vision correction in multiple vision zones is the incidence of visual dysphotopsias. Glare and haloes after implantation of a multifocal IOL are highly variable. In controlled clinical trials with the Tecnis IOLs (Abbott), the incidence of moderate haloes was 6% and severe halo occurred in 5%.1 In studies of the AcrySof multifocal lens (Alcon), 2.7% reported severe glare and 11% severe haloes.2

    Fundamentally, design considerations may explain these differences. However, additional factors such as residual refractive error, wavefront anomalies, IOL decentring, posterior capsular opacification and dry eye disease may also induce postoperative photic phenomena.3 Thus, although lens design is integral to reducing the potential for postoperative visual disturbances, the surgeon must still pay careful attention to optimising the ocular surface and performing meticulous surgery.

    It is hoped that a new-design lens will lower incidence of glare and halo via elongation of the focal zone. The TECNIS Symfony IOL (Abbott) may also provide improvements in chromatic aberration, providing patients with sharper vision. A recently completed patient satisfaction survey demonstrated that these design considerations translate to improved performance.

    The role of competing vision zones in visual disturbances

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