If someone is sighted, it means they can see. Also, if something is sighted, it means it has been seen.
Being sighted is usually a good thing. It means you can see and notice things around you.
Examples:
She is sighted and can see everything.
The lost dog was sighted in the park.
The sighted person helped the blind man cross the street.
The sighted cat saw the mouse and chased it.
The treasure was sighted on the island.
The sighted boy found the hidden toy under the bed.