| EYEGLASS | Lens used to observe ocular prosthesis having exchanged components (8) |
| MAGNIFYINGGLASS | Convex lens used to produce enlarged image of object (10,5) |
| BURNINGGLASS | Lens used to start fire (7-5) |
| GLASS | Common name for an ocular prosthesis (5,3) |
| EYE | Common name for an ocular prosthesis (5,3) |
| KEEPONESEYEOUT | Watch for when one won't use one's ocular prosthesis? (4,4,3,3) |
| SPYGLASS | Optical instrument used to observe transparent material |
| DECANTER | Bottle withdrawn, having exchanged ends (8) |
| BACKDROP | Having exchanged parts, withdraw stage curtain (8) |
| LEARNERS | Rare lens used by beginners (8) |
| BULLSEYE | Thick lens used as a condenser in a lamp (8) |
| TELESCOPE | It's used to observe select abuse, given the rise of EPO |
| PEEPHOLES | Small openings in doors or walls used to observe the surroundings |
| PERISCOPE | Instrument used to observe above from a submarine or a trench |
| GATEWAY | Means to enter or escape, having exchanged letters (7) |
| RUNDRY | Having exchanged words, rehearsal has ceased to flow (3,3) |
| FISHEYE | Lens used by swimmer to see? |
| NEWEL | Post from county town returned, having exchanged partners (5) |
| ANGEL | Investor in corner, having exchanged pounds and euros (5) |
| FOUGHT | Redoubt reports of having exchanged blows (6) |
