Design the near add power of anti-fatigue lenses from the intended working distance.
按 Hofstetter 平均调节幅度,保留 1/3 调节力,超出部分作为抗疲劳下加光;调节幅度 = 18.5 − 0.30×年龄。
| 年龄段 | 建议ADD | 调节幅度参考 | 适用人群 |
|---|---|---|---|
| 15-25 | 0.00-0.50D | ≥8.00D | 学生/年轻白领 |
| 26-35 | 0.50-0.75D | 5.00-8.00D | 电脑工作者 |
| 36-40 | 0.75-1.00D | 4.00-5.00D | 早期老视前 |
| 40+ | ≥1.00D | <4.00D | 建议使用渐进片 |
工作距离的倒数:调节需求 = 100 / 距离(cm)。如40cm工作距离 = 2.50D。
舒适用眼需保留调节幅度的1/2-1/3。若调节需求超过可用调节的2/3,则需要下加光补偿。
最小调节幅度 = 15 − 0.25 × 年龄;平均调节幅度 = 18.5 − 0.30 × 年龄;最大调节幅度 = 25 − 0.40 × 年龄。
NRA与PRA应相对平衡。若PRA绝对值大于NRA,提示调节紧张,需下加光补偿差异的1/2。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Near accommodative demand | Accommodative demand = 1 / working distance in metres, in dioptres | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Near addition | Near addition = required near power - distance correction | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Progressive lens specification | Near addition and corridor design of progressive lenses follow the lens specification | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
| Anti-fatigue design intent | A small near addition reduces the accommodative load and relieves asthenopia | ISO 13666:2019, Ophthalmic optics - Vocabulary |
根据年龄、调节幅度和工作距离计算抗疲劳镜片的建议下加光(ADD),缓解视疲劳。
抗疲劳镜片下加光设计器,根据年龄、调节幅度和工作距离计算建议下加光(ADD)值。。医疗专业工具,基于权威医学标准,仅供参考。