| Clue | Source | Date |
|---|---|---|
| OPTO- | New York Times | 23 Nov 2023 |
| Astonishing and enlightening ... or a phonetic hint to each starred clue's answer | Universal | 08 Aug 2023 |
| Surprising, to an optometrist? | Wall Street Journal | 28 Oct 2020 |
| Surprisingly informative | ||
| Shocking |