A very common cause for defective vision is continuous working on computer. This leads to great amount of mental stress. Both the mind and eyes gets obsessed by the harmful rays. Not just this even if you are under high work burden it would be really difficult for your eyes to resist for a longer time.  Another important cause could be insufficient diet which is low in nutrients required by the body and contains high levels of sugar and starch.

Proper circulation of blood and nutrient inside the body would be a great help for improving your vision. Add intake of dry fruits in your daily diet. They are considered as best ingredients for mind and indirectly for eyes. Another treatment would be exercises. Eye exercises include rotational movement of the eyes in clockwise and anti clockwise motion. Perform these steps for at least 3-4times in a day. This treatment would be really effective.

Concentration on one object is another good exercise. You can do it by looking continuously over the top of the nose for some seconds or a minute. Neck exercises are also helpful in reducing the problems of defective vision. Also improve your diet schedules for better results.