Large-anastigmatic-vision-zone progressive addition lens

To address the main challenge of limited vision zone and deteriorated visual clarity caused by residual astigmatism in progressive addition lenses, the study on large-anastigmatic-vision-zone progressive addition lens is conducted. By exploring the influence of optical power along the meridian on the growth rate of astigmatism, the design method for the meridian with tunable optical power is investigated. Subsequently, by extending the tunable optical power from the meridian to the entire lens surface along different shapes of contour lines, the effect of surface tunable optical power on the astigmatism and the vision zone is explored. This leads to the development of a design method for progressive addition lenses with low residual astigmatism, large vision zone, and surface tunable optical power. Based on this design method, progressive addition lens with a usable vision zone area exceeding 84% of the total lens area is optimized, while maintaining a maximum residual astigmatism of only 1.65 D. This holds significant value for the advancement of progressive addition lenses.