The iris of my eye, or the black of my eye is shrinking?

ive notice the black of my eye or the iris is shrinking. my parents were the one who noticed more. I'm 21 and i spend a lot of time on the computer. I was wondering if it could be that or insomnia.

The iris of my eye, or the black of my eye is shrinking?
Red is absolutely correct.





Your iris is designed to work in exactly this way. This is to protect the retina (back of your eye), and other bits inside your eye. If your pupil didn't do this, your eye would be in serious trouble every time you went out into bright sunlight. You should still wear sunglasses though, your iris isn't 100% protection from sunlight.





The iris in your eye is just like the iris in an older camera. When you want more light to get into the camera on a dim day, you just open up the iris by selecting a smaller f-stop. Your eye will do this automatically, so when there is little light around, your pupils will be quite large.
Reply:The black part of your eye (the pupil) enlarges and shrinks to acccomidate the amount of light entering the eye. If it was really bright in the room, your pupils would have looked really small. If it was dim in the room, you pupils would have been larger. This is completely normal.
Reply:Duuuude just calm down like the girl said