Bifocal and Multifocal Contact Lenses for Presbyopia and Myopia Control by Laura Remón, Pablo Pérez-Merino, Rute J. Macedo-de-Araújo, Ana I. Amorim-de-Sousa, José M. González-Méijome

“…Bifocal and multifocal optical devices are intended to get images into focus from objects placed at different distances from the observer. …”
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Effect of crystalline lens decentration and tilt on visual performance in eyes implanted with bifocal or extended depth of focus intraocular lenses by Yu Zhang, Jiaqing Zhang, Chen Liang, Yifan Xu, Jiaying Wu, Junming Wu, Yifan Zhang, Aixia Jin, Xuhua Tan, Lixia Luo

“…Patients undergoing phacoemulsification with bifocal (Tecnis ZMB00) or extended depth-of-focus (EDOF) (Tecnis ZXR00) IOL implantation were consecutively enrolled. …”
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Comparative Analysis of Visual Performance and Astigmatism Tolerance with Monofocal, Bifocal, and Extended Depth-of-Focus Intraocular Lenses Targeting Slight Myopia by Jie Xu, Tianyu Zheng, Yi Lu

“…To compare the visual performance and astigmatism tolerance of 3 intraocular lens (IOL) groups: monofocal, bifocal, and extended depth-of-focus (EDOF) IOLs targeting slight myopia. …”
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Isolated Bilateral Congenital Iris Sphincter Agenesis by Aparna Rao

“…Systemic examination was within normal limits. He was prescribed bifocal photochromic glasses for constant wear. Conclusions. …”
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Violet glasses… but with what lenses? Theoretical routes between the production and the reproduction of work by Andreina Colombo

“…Using the analogy of the “purple glasses”, three different approaches are identified: (i) with single vision lenses (looking at either production or reproduction), which attempts to describe the two realms from the viewpoint of only one of the two, ii) with bifocal lenses, which consider productive and reproductive work as equally relevant, while establishing clear-cut differences between the two, and iii) with progressive lenses, which allow us to see the two domains as part of a continuum, stressing their simultaneities, overlays and intermittencies . …”
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Highly Efficient and achromatic mid-infrared silicon nitride meta-lenses by Abdullah Maher, Mohamed A. Swillam

“…The two designs are modeled by inverse design with topology optimization problem with Kreisselmeier–Steinhauser (k–s) aggregation objective function, while the final design is depended on novel inverse design optimization problem with double aggregation objective function that can target bifocal points along the wavelength band producing high efficiency achromatic broadband multi-focal meta-lens under very high numerical apertures ( $$N{A}_{1} = 0.9, \, N{A}_{2}=0.88$$ ).…”
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Full-space trifunctional metasurface with independent control of amplitude and phase for circularly polarized waves by Li Xi Ming, Zhao Yuan, Lu Ren Pan, Sun Xiao Feng, Yang Zhao, He Hai Dan, Liu Yan Hui, Du Guo Hong

“…To validate the concept, a multifunctional metadevice is designed and verified by simulations and experiments, showcasing arbitrary near-field and far-field power modulation in full space. Lateral and axial bifocal metalenses with desired intensity distribution are designed in two reflection channels at 9 GHz, while multibeam generator with desired spatial scatterings and power allocations is designed in transmissive channel at 13 GHz. …”
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Optical Evaluation of New Designs of Multifocal Diffractive Corneal Inlays by Diego Montagud-Martínez, Vicente Ferrando, Juan A. Monsoriu, Walter D. Furlan

“…Comparison was made with the SACI at different defocus conditions. Results. The bifocal nature of the DCIs was demonstrated in a model eye for the first time. …”
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Design and Fabrication of Orthokeratology Lens with Multi-Linear and Spherical Aberration Corrected for Myopia Control by Zhengwang Li, Ruijin Hong, Dawei Zhang

“…These techniques predominantly comprise the employment of spectacles correction, orthokeratology (ortho-k), and soft bifocal and multifocal lenses. In the present study, a pioneering polish-free ortho-k lens was devised, featuring two reverse lines and three alignment lines, which, respectively, expedite the shaping process and enhance centration. …”
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Clinicopathological spectrum of central nervous system germ cell tumors: A single-institution retrospective study by Sreelekha Appasani, Neelima Radhakrishnan, Anitha Mathews

“…All multifocal tumors affected suprasellar compartment, being bifocal with pineal in four cases. A male gender predilection was noted among pineal region (9/10;90%) and multifocal tumors (5/7;71%). …”
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Exploring patient preferences for intraocular lenses selection in age-related cataract: a discrete choice experiment study by Qiaolin Zhu, Qiaolin Zhu, Qiaolin Zhu, Qianqian Sun, Qianqian Sun, Qianqian Sun, Yujia Huo, Yujia Huo, Yujia Huo, Xiaoling Yang, Xiaoling Yang, Xiaoling Yang, Hehe Huang, Hehe Huang, Hehe Huang, Shanshan Qian, Shanshan Qian, Shanshan Qian, Wenjing Lin, Wentao Yan, Wentao Yan, Wentao Yan

“…The most influential factors in IOL selection were cost, followed by presbyopia correction, with a preference for multifocal IOLs (trifocal and bifocal), spherical aberration correction, and astigmatism correction. …”
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