Myopia is the clinical term for Short-Sightedness. People who are myopic struggle to see things at distance and this can be remedied with spectacles and contact lenses.
In many cases Myopia is caused by the eye growing longer than normal, which means light does not focus accurately at the back of the eye.
Many children find they have rapidly changing myopia and their vision worsens rather quickly over a period of a few years. There are many factors that determine this but they can include: