A sight for sore eyes is somebody or something you are very glad to see. You are a sight for sore eyes.
It is warm and old-fashioned and is nearly always said to a person arriving. Some speakers use it to mean the opposite, which causes real confusion.
1phrasea sight for sore eyesSomebody or something you are very glad to see.
“A cup of tea at that hour was a sight for sore eyes.”
a sight for sore eyes is a phrase.
Practised in Idioms