When your iris changes in size from light why does does the area we can see not change?
In: Biology
The diameter of your pupil cannot shrink (as far as I am aware) such that you can’t see. As it gets larger the amount of light that enters your eye increases. If you were to artificially dilate your pupil, for instance if you went to an eye doctor and they used drops to dilate your pupils, you would findthat normally comfortable light conditions, like daylight, would be painful due to the abnormal amount of light striking the back of your eye. You might also gain a small amount of blurry and not useful peripheral vision.
Interestingly, if you close one eye in any very bright situation, you can tolerate brighter light than if you kept both eyes open. Just thought I would add that, for no particularly good reason.
This is analogous to the aperture of a camera lens by the way.
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