How much longer will I continue to have Myopia?

I've been diagnosed with Myopia 2-3 months ago. I'm 13 years old and I wanted to know how much longer I will be near-sighted?

forever....unless you get lasik surgery some day.

probably for the rest of your life. Myopia is caused by a slight change of shape in the lens or shape of the eyeball that causes the light that is supposed to focus on the back of your eye (on your retina) to focus elsewhere. Lenses, such as contacts or glasses can change where the light focuses and then you can actually see! There are a ton of great eyeglasses available - go to a Four Eyes or eyeglass chain and try on 100 different pairs (they will help you narrow them down if you want) - you will definitely find something you like that makes you look pretty or cool or whatever "your look" is.

You're not really looking at this 'right'.

The eyes are basically cameras. These cameras can be of 3 types. Cameras that see well far away, at distance...but then later in life when the lens of the eye gets firmer and harder to bend, these Emetropic people will need to get help to see up close. They get 'readers'.

The Far sighted people have relatively weak eyes. It's not that they see far well, it's that they have such a weak focus, that they have to 'work' to see normal distance or distance like the Emetrope. By bending the lens in their eye like 'normal' people bend the lens to see closer, they can focus at a distance. To read, they have to work to see at distance and then work some-more to see up close. So they have to do twice as much, or more, work to read. Far sighted people get headaches, can only study for about 20 minutes before they get sleepy or lose concentration, or eyes burn and tear.

Myopic people are focused already at some distance closer than far away. How close? Well, it depends. The number is relative to the distance away. the Power is equal to one over the distance in meters or P=1/d, where the d is in meters.
If the eyes are too strong and are focused at a meter in front of them of +1.00 in front of them, they'll need a -1.00 lens to move that focal point out to distance. If the eyes are focused at half a meter in front of them, or +2.00
or P=1/0.5=2
So they'll need -2.00 lens to move the focal point out to optical infinity.
A third of meter a -3.00
a fourth of a meter a -4.00
a fifth of a meter -5.00

but people who are near sighted or myopic have no problem seeing up close, so reading is easy. So they make lawyers and docs and those guys.

It's NOT a bad problem being myopic. But it does make it so people try and 'fix' the problem by glasses, contacts, or surgery. I'm not so sure if it were me that I'd do those surgical procedures, but I'm not myopic either.

The reason you were diagnosed at 13 is that you are starting to have to study at school. School becomes more important in your mid teens and beyond.

Are you blond? or have brown hair, or tall, or short, or?
same as the myopic thing. Most have a genetic myopia and that's that. It's not a disease. It's a refractive problem. Yes there are 'disease' myopes, but that's a whole different thing. If you were just diagnosed after 13 years, you don't have the high myopia problem.

Myopia isn't something that just "goes away". More than likely, you'll have it for the rest of your life. Usually it will keep getting worse until you reach around 25yrs old, then the progression slows down. Get used to it though...it's not going anywhere. You might want to think about contacts, if you're responsible enough, and you could consider laser surgery when you get older.

Paul B has the best answer here.

I was born with myopia...never got rid of it..and I'm in my 30s. Even after having laser correction surgery, my eye is still considered 'myopic', though I was corrected to 20/15 in both eyes.

Most likely you will always have some myopia...the degree or how much, that depends on your genetics.

But Paul B has much more hands on experience than I do...he's got a great answer there.