The best replacement for diplopia is double vision.

The best alternatives to diplopia are rated as following:
★★★★★  double vision
★★★  ptosis
★★  strabismus
★  blurred vision
★  nystagmus
★  binocular diplopia

Your alternative for diplopia is not listed? Suggest!
Speaking about diplopia, one probably shouldn't forget about ptosis.

Other search terms related to diplopia and their ratings are:
★★★★★ ptosis
★★ nystagmus
★ strabismus
binocular vision
You have in mind a companion for diplopia and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of diplopia in all years. Click on graph for more.
diplopia
double vision
ptosis