Before we begin we should probably clear up the misunderstandings and myths that have been implanted into our minds since children. You know when you were playing video games, watching the television on Saturday mornings, or from using your computer for hours at a time and your parents go in and start nagging at you? The most common argument they bring up is that it will ruin your eyes. That is a complete lie that they have been telling you since childhood and if you have children of your own, you should either stop or not tell them that.

Another myth is that reading books at night or watching the television at night can also ruin your eyes. This is also not true and has yet to be scientifically proven. However because of your eyes not getting enough light it may strain your eyes but in no way will it ruin your vision.

So what exactly is the reason for the less than 20/20 vision? Most likely is the shape of your eye. For people who have a natural 20/20 vision, their eyes are perfectly shaped like a ball. People who have less than perfect eyes are because their eyes aren't shaped round but more oval like.

Nearsightedness is what most teenagers have who need to wear contacts or glasses. Nearsightedness is when your eyes can not properly focus on objects that are far away which can be a big problem as it conflicts with some activities such as enjoying a movie at the theaters or even to everyday actions such as driving. What causes nearsightedness is when their eyes are a little longer than usual. Because of the extra length it causes the light to hit the retina indirectly that it blurs the person's vision.

The opposite of nearsightedness is farsightedness. And as it's opposite instead of the eye being longer it is shorter than normal. Because of this reduced distance the light coming into your eye doesn't hit the retina in your eye but instead hits behind it and therefore causes the blurring vision experienced by people with farsightedness. However many newborn children are born with nearsightedness and can't even recognize their parents visual features but with time most of them outgrow the condition.

Another vision condition is known as astigmatism and that is when your cornea isn't perfectly round. For people with this condition they can't see perfectly without the assistance of contacts or glasses.

Though glasses and contacts are a solution many people feel that it is inadequate and go under the table to correct their vision. Once a person has their eyes fully grown which is some time after they are 18 years old they can choose to have surgery on their eyes to make a much more permanent fix.