Myopia has commonly known as being nearsighted and shortsighted. Myopia presents with blurry distance vision, but generally gives good near vision. In high myopia, even near vision is affected as objects must be extremely close to the eyes to see clearly, and patients cannot read without their glasses prescribed for distance. Myopia usually caused by bad reading habits. For instance, you read too much or read under dim light, your eyes are easy to be hurt because you need to concentrate to books and keep much focus in eyes than daytime. Stress not only means body feels fatigue, but also nerves in brain cannot afford the burden of being lack of oxygen and blood. If this condition lasts in a long time, you may be easy to get myopia. So you'd better take a good rest as soon as possible and drink some black tea. Stress also does harmful to your body, heart diseases and headaches are commonly due to stress in nerves.
Ok, it seems that you are quite concerned about your eye health. Some people, especially teenagers , would have myopia due to improper use of eyes, and stress or burden of their study could make their myopia worse than before because stress would make their visual nerves abnormal and deteriorate.. So, to relieve your myopia, you have to take in some vitamins, which is indispensable to your eye health, and a better diet, also, good use of eyes could be very necessary.