Generally in everyday life, many people experience astigmatism in the eyes in the dark, or that there is a flash of light, which is most likely caused by astigmatism or vitreous clouding in this case. This generally tends to occur as we age, and is the cause of vitreous liquefaction or posterior detachment. It is best to go to the hospital for a dilated eye exam and an ultrasound of the eye, which is often not necessary for special treatment. Many people have this condition, and those with myopia may develop it at a relatively young age. If you feel that it affects your daily life, you can use lecithin complex iodine tablets, which are the only medication for vitreous turbidity and are effective, but you must rule out the possibility of thyroid nodules. If you have a thyroid nodule, it is best not to use this medication. You must pay attention to rest during the day, look less at cell phones and computers, and develop good eye habits and eye hygiene can also significantly relieve symptoms.