[From indications to outcome-A concise overview of supplementary intraocular lenses].

Supplementary intraocular lenses (IOLs) are used to correct spherical and astigmatic refractive errors after cataract surgery. They provide patients with improved uncorrected visual acuity, resulting in a higher degree of spectacle independence. For the implantation of supplementary IOLs two approaches are distinguished: the primary and secondary Duet procedures. Indications include extreme refractive errors, desire for reversible multifocality, residual refractive errors and pediatric cataract surgery. Monofocal, extended depth of focus (EDOF) and multifocal implants are available, some also as toric variants. Thanks to specialized IOL designs, supplementary IOLs have been optimized for implantation in the ciliary sulcus, making the procedure safe, effective and associated with minimal complications. Several studies have demonstrated the favorable safety profile, predictable refractive outcomes and improvement in uncorrected visual acuity. Continuous advancements in IOL design, including the availability of EDOF and multifocal implants, have further enhanced the benefits of supplementary IOLs. Through a relatively small, low-risk and quick procedure, individualized solutions can be provided for many patients, improving vision and reducing spectacle dependence.