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CN107615138B 渐进屈光力镜片的设计方法及镜片组 有权

渐进屈光力镜片的设计方法及镜片组
摘要：
在处方下加光度数(ADD)中与配适点(FP)对应的位置的下加光度数(MAD)大于根据目标距离设定的目标下加光度数(FAD)的情况下，将目标下加光度数(FAD)设定为主子午线中渐进开始点(PS)与渐进结束点(PE)之间的下加光度数，并且设定成渐进开始点(PS)与配适点(FP)之间的下加光度数的平均梯度不同于配适点(FP)与渐进结束点(PE)之间的下加光度数的平均梯度。在处方下加光度数(ADD)中与配适点(FP)对应的位置的下加光度数(MAD)小于或等于目标下加光度数(FAD)的情况下，在主子午线中渐进开始点(PS)与渐进结束点(PE)之间的至少包含配适点(FP)的部分区域中使下加光度数的梯度为固定。
摘要（英）：

When an addition power (MAD) at a position corresponding to a fitting point (FP) within a prescription addition power (ADD) is greater than a target addition power (FAD) set according to a target distance, the target addition power (FAD) is set as an addition power between a progression-start point (PS) and a progression-end point (PE) on a principal meridian, and in addition the average gradient of an addition power between the progression-start point (PS) and the fitting point (FP) is set to differ from an average gradient of an addition power between the fitting point (FP) and the progression-end point (PE). When the addition power (MAD) at the position corresponding to the fitting point (FP) within the prescription addition power (ADD) is equal to or smaller than the target addition power (FAD), a gradient of the addition power is made constant in a partial region including at least the fitting point (FP) between the progression-start point (PS) and the progression-end point (PE) on the principal meridian.

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