Insomnia means getting insufficient sleep which can be in the form of difficulty in falling asleep or difficulty in maintaing sleep. Insomnia is just a symptom, like fever, and is not a disease by itself. Diseases that can disturb sleep, like pain or anxiety usually cause insomnia.

Myopia or short sightedness is a vision problem experienced by almost one-third of the population. It is the inability of a person to see the distant objects clearly.

For proper eyesight, the cornea (the clear window in front of the eye) and the lens (behind the pupil) must properly focus or "refract" light onto the retina (at the back of the eye). If the length or shape of the eye is not ideal, the light may get focused too early or too late leaving a blurred image on the retina. This problem is often discovered in school children and becomes progressively worse through adolescence and stabilize in early adulthood.

Causes of Myopia
Improper reading habits is possibly the commonest cause of short sight.
Sometimes it can be due to lack of vitamins.
Myopia can also be a hereditary condition.