Convert lens surface parameters to optical power expressed in diopters.
由焦距(米)按 P = 1/f 计算透镜屈光度(D)。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Definition of dioptre | F = 1/f with f in metres, expressed in dioptres | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Sign convention | Positive (convex) lenses converge light; negative (concave) lenses diverge it | ISO 13666:2019, Ophthalmic optics - Vocabulary |
| Thin lenses in contact | F = F1 + F2 | Jenkins FA, White HE, Fundamentals of Optics (4th ed.), McGraw-Hill |
| Thin lenses separated | F = F1 + F2 - (d/n) · F1 · F2, where d is the separation and n the medium index | Jenkins FA, White HE, Fundamentals of Optics (4th ed.) |