of how much mega pixels our eye-lens is? or how much it should it be considered?

Answer 1

The rods and cones in our eye can be equated to pixels. But the distribution is not even. The density is much higer at the focal point (yellow spot) than in the peripheral.
So, as our eye scans a picture this high resolution analysis is applied to many points on the picture.

So you can't say, "our eye has 1 million pixels so there is no point in having more than a 1 mega pixel camera"

Answer 2

That depends on viewing distance.

At 10 feet in video lines of resolution, a DVD exceeds the eye at 20/10 vision, however up close it another story.

On a photographic print 12+ MP is considered equal to fine grain 35mm film.

No digital camera can out perform an 8 x 10 sheet film camera.

Digital cinema and HDTV is 2 MP and designed to be viewed at 12 feet or further.

Answer 3

We don't see in pixels, we just see an image created by light, and light is everywhere (on our earth), so we have the "raw image".