Some diabetics, once they find out that their blood sugar is high, think that it would be good to lower their blood sugar to normal right away. For example, there is a family history of diabetes Mr. Lee was diagnosed with diabetes at the age of 28, after the discovery, in order to control blood glucose, Mr. Lee began a crazy sugar-lowering behaviors, including mandatory diet, increase the dose of medication. The effect is very obvious, blood sugar results are very satisfactory, from 20mmol / L down to 6.5mmol / L, the mood is very happy, but when he was immersed in the joy of success, the morning up and found that the vision is more and more blurred, see things always have heavy shadows, terrified, and rushed to the hospital ophthalmology examination, ophthalmology, said, or need to be reviewed by the endocrine. After analyzing the situation, the doctor told this is because the blood sugar drop too fast resulting in eye complications. When the blood sugar drops rapidly, the plasma osmotic pressure plummets, so that the water in the tissues of the eyeball increases, causing changes in the refractive error of the eyeball, which leads to double vision, causing blurred vision. In general, there is no need to worry too much, and most of them will recover slowly after a few days. Most diabetics have a similar experience, they treat high blood sugar as sugar control, and can’t wait to get it under control in minutes. In fact, diabetics will appear a state of tolerance, if the blood sugar drop too fast will not only damage the eyes, but also trigger hypoglycemia, myocardial infarction, cerebral infarction and many other complications occur. So remind the sugar lover, found high blood sugar, do not be anxious to drop normal at once, smooth sugar reduction is the most important.