Wiktionary
sight for sore eyes
n. (context idiomatic English) A pleasing sight; something that is beautiful to look at.
Wikipedia
Sight for Sore Eyes
"Sight for Sore Eyes" is the tenth overall single from the British band M People released as the lead single from multi-platinum album Bizarre Fruit. Written by Mike Pickering, Paul Heard and Heather Small and Produced by M People. It was released on 7 November 1994. The song peaked at number six on the UK Singles Chart.
Usage examples of "sight for sore eyes".
The cabbage-rosed wallpaper, with its big, blood-red roses and nasty green leaves, was a long way from being a sight for sore eyes.
And there coming toward him was a sight for sore eyes: Rafael de Tomaso and Marco and Marco's brother.