Speaking of myopia, are when objects in the distance can vaguely be seen. Nearby things appear short-sighted, although sharp. Shortsightedness is also known as myopia. The term myopia comes from the Greek word "Myops," The word often denotes for the typical short-term squint.
The nearsightedness (myopia) is a type of ametropia when the person in the distance may not look sharp. This is because the eyeball is too long relative and the refractive power of cornea and lens is too large. Shortsightedness is generally associated with glasses or contact lenses or even through various eye operations (Refractive Surgery) balance.
What causes myopia? The myopia is usually hereditary. Sometimes you can even inherit the certain diseases in the womb, during childhood or adulthood are the cause for his ametropia. It is unclear whether other factors in the development play a role, such as frequent reading or work on computers in childhood, especially in poor lighting conditions. Myopia forms around 80% of the cases is a axle myopia, a myopia by a long eyeball. Often involves the so-called Simplex Schulmyopie or myopia. This often starts at the 10th to 12 Year of life, and usualy goeas away at the age of 20. The patient usually experience only mild to moderately nearsighted (up to 6 diopters).
Always remember that shortsightedness may continue, even in a higher age, this will be malignant myopia (myopia Maligna, Progressive) called. Especially this form may lead to subsequent problems.
A refractive myopia is a myopia by changing refractive power of the media transparent in the eye. This may cause some diseases on case to case basis, for example, when a lens opacity (cataract, cataract), with a conical keratoconus or a spherical shape of the eye lens (Lentiglobus).