Sight or Site?
Exemple : ‘’Her sight deteriorated as she got older.’’
"Sight" is a noun meaning the act of seeing. It derives from the Old English "sihþ" which denoted "something which was seen."
Exemple : ‘’The site contains a lot of very useful information.’’
"Site" is used as a noun and can either denote a place where a particular thing is located or a particular event happened or can be used as a shortening of the word "website."