Thanks for your question.
Yes sinus infection can cause blurry vision because the wall between orbit and nose is common. But this is serious condition because this puts vision at risk.
If you are feeling so, you should visit ER because this can be serious.
There can be other causes for blurry vision , sometime due to allergies but definitely we cannot take a risk here.
I hope this helps you.
Thanks for your input.
No you acted right and treatment given to you by your doctors is very good for this problem.
I would suggest that you should use OTC xylometazoline nasal spray 2 puffs thrice daily, Tab Sudafed twice daily. Use both if no high blood pressure issues. Use both for two weeks. More take antiallergic Tab Claritin once daily.
These will assist a lot with antibiotics.