Code Blindness

Definitions

The tendency to stop seeing obvious problems in code after staring at the same section for too long, often because familiarity and fatigue hide mistakes from fresh perception. It is one reason breaks, pairing, and reviews help so much.
In plain English: Missing obvious issues in code because you have been looking at it too long.
Example: "I had code blindness after the third hour, so the missing null check only became obvious when someone else looked."