Hi Christie,

Monocular diplopia is commonly caused by physical defects such as astigmatisms. It is very rare that this sort of double vision is caused by a serious issue, as can be found with binocular diplopia.

I suffer from the latter (unstable) caused by a lesion in the Pons area of my brain. It is totally debilitating, has stopped me driving, enjoying tv, has made reading and typing here exceedingly hard work…

Your Opthalmologist should have no problem spotting any physical cause and I hope he can suggest a solution.

Dave.