Meaning of the word "as far as the eye can/could see" in English

What does "as far as the eye can/could see" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

as far as the eye can/could see

US /æz fɑr æz ðə aɪ kæn/kʊd siː/
UK /æz fɑːr æz ðə aɪ kæn/kʊd siː/
"as far as the eye can/could see" picture

Idiom

over a very large area; as far as the horizon

Example:
The desert stretched out as far as the eye could see.
From the top of the hill, we could see fields of sunflowers as far as the eye could see.