Select lens refractive index from Abbe number and thickness targets.
低度数选低折射率(色散小),高度数选高折射率(更薄),光学优先在高度数时跳过高色散档(1.67/1.74)选 1.70/1.71。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Definition of refractive index | n = c/v, where c is the speed of light in vacuum and v in the medium | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Snell law | n1 · sin(theta1) = n2 · sin(theta2) | Descartes R., La Dioptrique (1637) |
| Abbe number | V = (n_d - 1)/(n_F - n_C), measuring the dispersion of the material | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Material trade-off | A higher index gives thinner lenses but typically a lower Abbe number and more chromatic dispersion | ISO 8980-1:2017, Uncut finished spectacle lenses - Part 1: Single-vision lenses |
根据处方度数推荐合适的镜片折射率,并估算边缘厚度、阿贝数与镜片重量,帮助您选择最合适的镜片材料。