We have eyes for seeing. Eyes are also how we have contact with other people. It would be quite different if we didn't have eyes because we would be missing one of our senses and we need all 5 senses. We all would look different but it would be normal if we all had no eyes. Eyes are how we do things our jobs, school, homework, laundry, cooking, and way more. That does not mean blind people cannot do anything they can if they want to but it will take longer. But if you want to do it that bad you shouldn't care how long it takes. Hope this was more helpful then just saying "for seeing". Thanks for asking. I love helping.
Your eyes are for when you need to know where something is. You can see in 3D (3 dimensional) view of objects. You need to see because you need to know where your going at all times. Even if you go to work. I can understand for blind people they can't help that they can't see.