Bad prescription of glasses will affect the vision, prescription of glasses is very delicate work, the degree of optometry, astigmatism axis, glasses pupil distance, are very strict requirements. If the lenses are not suitable, you will have headache, dizziness and unclear vision after wearing them. If the axis of astigmatism is not appropriate, there will also be headaches, dizziness and other discomfort. Pupil distance is also very important, sometimes the pupil distance is too large or too small can also cause strabismus. Therefore, it is important to go to a professional institution to get your glasses. Go to the hospital for an optometry, and then go to a professional institution to get your glasses.