| PERISCOPE | Fairies manage to get an optical device |
| TELESCOPE | Using moulded steel, manage to take an optical instrument (9) |
| ENDOSCOPY | Procedure in which an optical instrument is used to inspect an internal area of the body (9) |
| CAMERALUCIDA | From the Latin meaning "light chamber", an optical device used as an aid for drawing, invented by palladium and rhodium discoverer Dr William Hyde Wollaston (6,6) |
| LASER | Earl's built an optical device (5) |
| APHORISM | Saw house through an optical device (8) |
| LENS | An optical device (4) |
| EPISCOPE | Piece op's deployed, an optical device? (8) |
| GLASS | Magnifying -; associated with Sherlock Holmes, an optical device for studying insects, old coins and stamps, or reading books/newspapers (5) |
| FINDER | A discoverer; or, a short word for an optical device on a camera for determining the field of view (6) |
| RETICLE | Network of fine lines or threads in the eyepiece of an optical instrument used to determine an object's scale or position; also called graticule (7) |
| UNFOCUSED | Of an optical instrument, not adjusted (9) |
| NAKED | To the ___ eye (unassisted by an optical instrument) |
| COMA | In which to be unconscious of an optical fault? (4) |
| PARALLEL | Of light rays, parallel to axis of an optical system (8) |
| IMAGE | One game to turn an optical counterpart |
| PARAXIAL | Of light rays, parallel to axis of an optical system (8) |
| OPART | A form of abstract art to create an optical illusion (2-3) |
| APERTURE | An adjustable opening in an optical instrument (8) |
| COPYREADER | Subeditor to reproduce an optical scanner (10) |
