Compute the visible-light transmittance of tinted spectacle lenses from dye density.
| 类别 | VLT范围 | 适用场景 | 标准 |
|---|---|---|---|
| 0类 | 80%-100% | 室内/夜间 | 无色或极浅 |
| 1类 | 43%-80% | 时尚装饰 | 浅色染色 |
| 2类 | 18%-43% | 日常通勤 | 中等染色 |
| 3类 | 8%-18% | 户外强光 | 深色太阳镜 |
| 4类 | 3%-8% | 高山/雪地 | 特深色，不可驾驶 |
均匀降低各波长光线，不改变颜色感知，最适合日常太阳镜。
增强对比度，改善景深，适合驾驶和高尔夫等户外运动。
平衡各色光透射，减轻眼疲劳，适合长时间佩戴。
提高对比度和景深，适合雾天/夜间，但有色觉偏差。
时尚装饰色，减少眩光，适合雪地/水面环境。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Visible transmittance | tau_V is the luminous-flux-weighted transmittance over the visible band | ISO 8980-3:2013, Uncut finished spectacle lenses - Part 3: Transmittance specifications and test methods |
| Beer-Lambert law | tau = 10^( -epsilon · c · l ), with epsilon the absorptivity, c the concentration and l the path | Lambert JH (1760), Photometria; Beer A. (1852), Bestimmung der Absorption des rothen Lichts |
| Transmittance categories | Categories 0 to 4 by visible transmittance guide the choice for different lighting | ISO 12312-1:2013, Eye and face protection - Sunglasses and related eyewear |
| Depth versus concentration | Transmittance falls exponentially, not linearly, as dye concentration rises | Beer-Lambert law; Born M, Wolf E, Principles of Optics (7th ed.) |
根据染色颜色和浓度计算可见光透射比(VLT)，评估明视效果和场景适用性。
染色镜片透光率计算器，根据染色浓度计算可见光透射比(VLT)，对比不同染色颜色与明视效果。。医疗专业工具，基于权威医学标准，仅供参考。