How far does an eye can see?

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How far does an eye can see?

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breckenridgeback commented

There is no hard distance limit on vision. Things just get smaller (and therefore dimmer) the further away they are.

The furthest object that you can normally see with the naked eye under reasonable nighttime conditions is the Andromeda Galaxy, 2.5 million light-years away. (Under a very very dark sky, you might be able to make out the Triangulum Galaxy at 2.7 million light-years, but it’d still be quite hard to see.)
RaoulDuke422 commented

Human eyes have no limit. If light hits your retina, you will experience the respective visual information.

And as we all know, light travels forever if not obstructed.