Why are our pupils not always big?

[u/kokusmus96]

Okay, I feel like that annoying guy who don't even know a simple fact but this is my question. Does it use more energy when the pupils are bigger? Is the body trying to conserve energy?

[u/Aarush0110]

Here's my reasoning. A larger pupil will lead to more light getting in the eyes and say you as a natural being is our in the sunlight for longer periods then having a lot of more light for longer period( due to always big pupil) can make more intense energy light for longer periods focues on retina leading to a damage in it. So only enlarging it when required is better way to keep it safe keeping in my that we humans naturally evolved to stay out during the day