Can sinus/ear infection cause partial loss of vision?

answered:

Yes

Loss_of_vision
This would be seen in an acute complication of a sinus infection - a peri-orbital abscess which is surgical emergency. If this happens, you must be evaluated for a possible abscess.
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Laparoscopic surgery Sinusitis Abscess Infection Sinus Ear infection Vision Loss of vision Ear Otitis media

Unlikely

Vision
Ear infection cannot lead to visual loss. Sinus infection rarely can escape the sinus and enter adjacent tissue including the nerves of vision. Basically for this to happen you would have to profoundly neglect your sinus infection for a lengthy time to allow such penetration. You should see your otolaryngologist if you suspect your sinuses or ears are infected.
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