As far as one can see is an idiomatic phrase that means the entire visible area. The antonyms for this phrase include limited, restricted, confined, or narrow. These words convey a sense of limitation or boundary, indicating that the view is obstructed or cut short. Another set of antonyms for "as far as one can see" are vast, extensive, boundless, or infinite, which suggest an unobstructed and expansive view. These words imply that nothing is obstructing the view, and the horizon extends far beyond the observer's line of sight. In conclusion, the antonyms of "as far as one can see" convey different limitations or extensions in the visual field.