Review of progressive addition lens design methods
This paper reviews the design methods of progressive addition lenses to address the increasing number of presbyopic patients in the context of the global aging trend.The paper first introduces the basic design principles of progressive addition lenses,including their four functional zones:the distance vision zone,the near vision zone,the gradual transition channel,and the peripheral astigmatism zone.The paper then discusses three main design meth-ods in detail:the direct design method,the indirect design method,and the gradient refractive index design method.The direct design method achieves continuous multifocal variation by precisely controlling the geometry and curva-ture changes of the lens;the indirect design method designs customized progressive addition lenses by minimizing an optimization function;the gradient refractive index design method utilizes the gradual change in refractive index of the material to achieve increasing optical power.The paper notes that,while these methods have made significant progress in improving optical performance and meeting individualized needs,they are limited by design complexity,manufacturing cost,and material properties.Finally,the paper emphasizes the importance of computer-aided de-sign and manufacturing technology in optimizing design methods and improving production efficiency,and suggests directions for future research to meet the ever-changing needs of visual health.
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