When your iris changes in size from light why does does the area we can see not change?
In: Biology
The size of the pupil does not change the size of the image because the eye captures an inverted image (as if it had a single tiny hole). What is high appears at the bottom of your eye, what is left on the right side, and so on. Contracting the pupil only makes the image darker.
It behaves like a camera, or a shoebox with a tiny hole. This is enough to make a complete image. It will be inverted, since it has to go through a single point. And it will be pretty dim.
To make it brighter you need a bigger hole which will make the image fuzzy. Putting a lens over the hole removes the fuzziness and focus the image.
The front part of the eye is a lens which focuses the image on the back of the eye (the retina).
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