Historical clue formulations

• Unfocused — 2021-03-07
• Like one's eyes after a poor night's sleep — 2020-05-16
• Like eyes after an all-nighter — 2016-01-17
• Like the eyes just after waking — 2014-07-21
• Like tired eyes, maybe — 2013-04-08
• Dull, as vision — 2002-06-20
• Not sharp, as eyesight — 1996-11-25
• Unclear, as vision — 1995-10-09