 |
| |||
| progressive power lens (r313); power-variation lens (r313); progressive lens (CubaLibra); PAL (progressive addition lens: The progressive addition lens (PAL) is a spectacle lens design with progressive refractive power changes across the lens surface to provide om_ya) | |||
| прогрессивная линза: 2 phrases in 1 subject |
| Optics branch of physics | 2 |