Myopia is also called nearsightedness as those who suffer from it can see close objects in focus, but distant objects appear blurry.
Short sightedness can often develop quickly in children as they grow, becoming worse in teenage years. As you enter your twenties the condition tends to stabilize.
Myopia can often be spotted in children because of the tendency of those kids to squint at objects.
So what exactly causes Myopia?
To understand this, we need to understand a little about the structure of the eye.
At the back of the eye is the retina. You can think of the retina as being like a cinema screen onto which the world around you is focused. As you look around you, light from the objects you are looking at passes through the outer layer of your eye (the cornea), through the iris and lens, and finally onto the retina. As the light passes through these layers, it is bent so that the images are focused on the retina.
Myopia is a defect in the eye that causes images coming into the eye to focus in front of the retina. The result is that the image will be blurry and out of focus.
Myopia can be caused by the following:
1. The cornea (the outer surface of the eye) is too curved.
2. Your eyeball is too long.
When someone suffering from Myopia looks at distant objects, the light rays from those distant objects are near enough parallel to each other. To focus the image, the rays need to be bent so that they converge onto the retina at the back of the eye. However, because of the problems mentioned above, the rays are bent too much and converge in front of the retina.
However, when someone with Myopia focuses on a near object (for example, when reading a book), the rays of light from those close objects enter the eyes at an angle, which means the light needs to be bent more, and in this case , the rays do focus properly on the retina, so near vision is not affected by the myopic condition.
There are a few different treatments for people with myopia who want to see clearly.
When you wear glasses or contact lenses to fix myopia, those lenses ensure that the light entering your eye converge on the retina, thereby bringing images into normal focus.
Another option to correct Myopia is LASIK eye surgery, where the surgeon can reshape the cornea so that light focuses properly. For more information on Myopia, especially if you think you or your children suffer from this condition, consult your doctor.