'eyesight' originates from Old English, specifically the word 'ēageseohð,' where 'ēage' meant 'eye' and 'seohð' meant 'sight.'

'ēageseohð' transformed into the Middle English word 'eiesight,' and eventually became the modern English word 'eyesight.'

Initially, it meant 'the act of seeing with the eyes,' and this meaning has largely remained the same in modern usage.