“Double Vision from Botox”

when Botox is used for cosmetic improvement, none of this should happen. I read about the double/blurry vision & always mention it in my instruction courses to prospective injectors. I never saw it in real life since I started offering Botox injections in 1996. By co-incidence, only this week I saw my 1st case of this complication in a patient who was injected elsewhere & came for 2nd opinion. Each eye sees perfect when the other eye is covered. However, vision is blurred with both eyes open. this is due to weakness of the muscles that move one eye, so the 2 eyes do not synchronize their movement & thus send 2 different images to the brain, so the objects seen are blurry. Nothing can be done until the effect of the medication goes away, usually in a several weeks. Most likely, a large dose of botox was injected & part of it went to the 'extra-ocular muscles" & caused this problem.