how far can a regular eye see?
2006-12-26 23:02:17 · 6 answers · asked by the girl 3 in Science & Mathematics ➔ Medicine
If you think about how the eye sees then this question doesn't make too much sense... its not that the eye is reaching out as far as it can... light just comes in to it - the light might have come from the opposite side of the Universe. So a human eye, unaided can see many thousands of light years away - which means only that the eyes can detect light from objects sent 1000's of light years away, thousands of years ago.
2006-12-27 00:49:27 · answer #1 · answered by Anonymous · 3⤊ 0⤋
Very far.
The Andromeda galaxy is visible to the naked eye, and it is 2.5 million light-years away.
The limit of human distance vision is not dependent on focus, but on light-gathering ability of the eye. The threshold of brightness for the human eye is sometimes expressed in astronomical magnitude, where 6 is the dimmest that can be seen unaided by a telescope.
2006-12-27 04:22:06 · answer #2 · answered by Jerry P 6 · 0⤊ 0⤋
To the horizon and as far as the sun and stars. Anything else requires some sort of device to define what we see any better.
2006-12-26 23:11:58 · answer #3 · answered by darscoind 2 · 0⤊ 0⤋
Well, you can see stars which are millions of light years away...
2006-12-26 23:07:03 · answer #4 · answered by PragmaticAlien 5 · 1⤊ 0⤋
as near as 25 cm,as far as infinity
2006-12-26 23:07:24 · answer #5 · answered by anushree 2 · 0⤊ 1⤋
depends on the person and their indiv. eyes and vision. a long ways though - enjoy!
2006-12-27 02:35:38 · answer #6 · answered by answers4questions 4 · 0⤊ 0⤋