Well, yes, it is normal to have blurry vision, after you have taken sinus surgery. Generally speaking, there are many reasons which can lead to blurry vision. Eye infection can be the most common reason leading to it. After you have taken sinus surgery, your eyes will be sensitive, and they are also easily infected by some virus. In that way, it will just make your eyes infected, leading to blurry vision. For your situation, you should just take some measures to treat it. For example, you can put some cool teabags under your eyes. It can be effective.
Yes, it is normal to have the temporary blurry vision after the sinus surgery. After the sinus surgery, your nerves in nose and eyes may still be irritated because of the medicine. You should protect the eyes and nose carefully by having the good habit of diet and sleep. If your blurry vision still does not disappear after a long time, you should go to see the doctor and find the reason.
Yes, one of the common side effects that sinus surgery might cause is blurry vision. Sinus surgery removes the diseased or extra blockage tissue in sinuses. There are some side effects and complications you need to know before this surgery, which probably has been introduced by your doctor. The risks of this surgery include possible failure to resolve infection, recurrence of the original problem, bleeding or bloody discharge, and loss of smell or taste and so on. Besides, it could damage the eyes. Eyes are closely connected to nose. The optic nerves may be damaged by some tools in sinuses during this surgery when surgeon tried to break the blockage. With this damage, patient might have blurry or cloudy vision or temporary vision loss. Yet according to resources now, most patients restored vision when he/she began to heal. So don't worry too much. I suggest you to consult your doctor or ophthalmologist for detailed information and proper treatment. Good Luck!