Calculate the progressive-addition corridor length and fitting height for progressive lenses.
| 通道类型 | 长度(mm) | 适用场景 | 最低镜圈高度 |
|---|---|---|---|
| 超短通道 | 9-11 | 小镜框、首戴者 | ≥24mm |
| 短通道 | 11-13 | 中低ADD、小框 | ≥26mm |
| 标准通道 | 13-15 | 通用、中高ADD | ≥28mm |
| 长通道 | 15-18 | 高ADD、阅读需求大 | ≥30mm |
ADD≥2.50D 建议标准通道(14mm)，ADD≥3.00D 建议长通道(17mm)，近用区中心须留出约 5mm 余量。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Definition of the corridor | The transition length between the distance and near zones of a progressive lens | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Minimum fitting height | Minimum fitting height = corridor length + allowance for the distance zone above the pupil | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
| Cost of a short corridor | A shorter corridor steepens the peripheral astigmatism gradient and hinders adaptation | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
| Relation to the near addition | A higher near addition tightens the match required between corridor length and fitting height | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
根据下加光ADD与镜圈高度推荐渐进通道长度，核算最小装配高度，辅助渐进多焦点镜片选型。
多焦点渐进通道长度计算器，根据ADD下加光和镜圈高度计算渐进通道长度与最小装配高度。。医疗专业工具，基于权威医学标准，仅供参考。