The optics of simultaneous vision intraocular lenses

This review examines the optical principles underlying presbyopia-correcting simultaneous vision intraocular lenses (IOLs), providing a fundamental, physics-based perspective on their function. Rather than focusing on commercial models or clinical outcomes, this work aims to enhance the understanding of the optical mechanisms governing simultaneous vision. The discussion covers key design variations in both refractive and diffractive IOLs, explaining how wavefront modulation can affect light distribution and visual performance. The analysis is presented from the dual perspectives of a former eyecare practitioner and a vision scientist experienced in the research and development of presbyopia-correcting IOLs. The review uses accessible language aimed at nonphysicists and uses accurate optical simulations and general design representations to illustrate the optical principles of contemporary presbyopia-correcting IOLs. Although variations in lens geometry and material properties influence optical performance, the core concept remains consistent. By elucidating the fundamental physical principles behind modern IOL designs, this review aims to enhance professional knowledge and provide a robust foundation for evaluating emerging technologies and developing innovative solutions for presbyopia correction.