| Lens type |
| Type of lens |
| Double vision? |
| Optical device |
| Like some lenses |
| Like some glasses |
| Kind of spectacles |
| Dual-purpose, as lenses |
| Like some eyeglass lenses |
| Like Ben Franklin's glasses |
| Dual-purpose bit of eyewear |
| Lens created by Ben Franklin |
| Split right before your eyes? |
| Having parts for near and far vision |