the.com/sight for sore eyes

The relief of seeing someone you actually wanted to see.

means A person or sight so welcome that it soothes you just to see them.

from Recorded from the 1700s — Jonathan Swift used it in print in 1738 — built on the simple logic that something pleasant to look at would even ease eyes that were aching or inflamed. The phrase outlived the literal ache and settled into pure warmth: the eyes aren't really sore, you're just that glad to see someone.

origin
Coined by Jonathan Swift in 1738
literal logic
Good sights supposedly soothed irritated eyes
usage
Now means pure gladness, not optometry
irony
Often said to people who look exhausted
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