as far as the eye can see 的意思是 “某事物填满了视野，直到看不见”，可以用来描述事物 “一望无际” 或 “广袤无边”。

【例句】
The forest extends in all directions as far as the eye can see.
森林朝四周延伸，一望无际。

There is clear sky as far as the eye can see.
一眼望去，尽是晴朗的天空。