When your iris changes in size from light why does does the area we can see not change?
In: Biology
The iris is a lens not a simple hole. A window is like a hole, you see a smaller image in a smaller window. A lens is different because it bends light and direct the image on a surface on the other side. A good lens will bring the light of each point on one side to a different point on the other side. Between each on these pair of points, the light can take many path as long as it goes through the lens. The field of view of your eyes depends on the size of the retina behind the iris and doesn’t change. The size of the iris only changes how much light the lens gets to bend into the eye.
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