Plain English Meaning
Your vision keeps going fuzzy and then sharp again on its own. One moment the gauges look crisp, the next they look soft, and you didn't do anything to cause the change.
Full Definition
A physical symptom of fatigue in which the eyes intermittently lose and regain sharp focus, so objects such as instruments, charts, or distant traffic appear briefly clear and then briefly blurry without the pilot consciously changing where they are looking.
Context Anchor
Seen in fatigue and situational awareness training, especially when discussing warning signs that a pilot, student, or instructor should notice before performance gets worse.
Why Pilots Care
It indicates accumulating fatigue that degrades situational awareness and raises the chance of missing critical flight information.
Grounding Statement
If the panel, , , or keeps becoming blurry and then clear again, treat it as a possible fatigue warning sign, not just an annoyance.