Locate the binocular pupil height (segment height) for multifocal lens fitting.
比例 50%–70% 为光学中心位置正常；偏低光学中心偏上、偏高偏下，影响装配与视觉质量。
| 镜片类型 | 最小瞳高 (mm) | 理想瞳高 (mm) | 说明 |
|---|---|---|---|
| 单光镜片 | 无限制 | — | 瞳高对单光片影响小 |
| 渐进短通道 | 14 | 16-20 | 适合小镜框 |
| 渐进标准通道 | 18 | 20-24 | 常规镜框 |
| 渐进长通道 | 22 | 24-28 | 大镜框，适应性好 |
| 抗疲劳镜片 | 14 | 16-20 | 下加光0.50-0.75D |
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Definition of pupil height | The vertical distance from the pupil centre to the lower inner rim of the frame | ISO 8624:2011, Ophthalmic optics - Spectacle frames - Measuring system and terminology |
| Fitting requirement | Fitting height must place the distance zone above and the near zone below the pupil | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
| Consequence of insufficient height | Too low a fitting height cuts off the near zone and makes near vision unusable | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
| Matching the corridor | Check the fitting height together with the chosen corridor length and minimum fitting height | ISO 8980-2:2017, Uncut finished spectacle lenses - Part 2: Progressive power lenses |
计算瞳孔中心到镜框下缘的垂直距离（瞳高），评估是否满足渐进多焦点镜片的定位要求。
瞳高定位器，计算瞳孔中心到镜框下缘的垂直距离，用于渐进多焦点镜片佩戴定位与安全范围评估。。医疗专业工具，基于权威医学标准，仅供参考。