Well, generally speaking, it's possible to get blurred vision owing to hangover. As we all know, drinking too much alcohol is absolutely bad for our eyes. Alcohol can easily stimulate the optic nerve and lower the optic nerve conduction, besides, the stimulation of alcohol will lead to edema, which can causes the hyposthenia of vision. In addition, drinking too much can easily interfere the utilization of various vitamins, on the contrary, increase the consumption of vitamins. However, vitamin A is needful nutrients for the retina. If the vitamin A is decreased, the vision will be decreased. What's worse, there are other side effects of hangover, such as itchy eyes, conjunctivitis, iritis, keratitis, ect. Thus it is recommended that you should drink less alcohol especially for the hangover for the sake of your health.