Does sinus pressure cause blurred vision in one eye?

No. Blurring in one eye is typically a problem (from front to back of the visual system) with the tear film, cornea, anterior chamber, lens, vitreous, retina, orbit, optic nerve, and any connection to the visual cortex. Sinus fullness doesn't directly affect vision.
Blurry. Possibly. Extreme sinus congestion may cause blurred vision. In this case, a a decongestant may help. If the blurred vision persists, call your local ophthalmologist...

Related Questions

Huge sinus pressure for two months. ..Nose, under eyes. Tension on my neck, being dizzy, out of balance, luck of concentration, blurry vision?

Sounds serious. You are presenting with symptoms that are more neurological than sinus like. If you are having lack of concentration and blurring of vision, then even if it were secondary to sinusitis, you need to see a physician as soon as possible.