I have the same problem with you at the beginning. But now I know three kinds of vision problems. I'd like to share this information with you. They are nearsightedness, farsightedness and astigmatism. I think they are the most common vision problems in our life. And I also know that many vision problems can be cured by some surgeries.
Some people are born with some kinds of vision problems if their parents have those vision problems too. But most of the vision problems are caused by bad habits and the wrong way of using our eyes. We know that nowadays more and more things can affect our eyesight, such as computer screen, TV and so on. We often spend long hours in front them every day. This will badly affect our eyesight and cause vision problems.