esotropia
This is when the eyes turn inwards (cross-eyed). Ocular alignment problems like this can develop from many sources such as congenital crossed-eyes (which is usually treated with strabismus surgery during childhood to straighten the eyes out). Crossed eyes can also occur from decompensation of a pre-existing esophoria (a natural tendency for the eyes to turn inward). Acute crossing can happen after a stroke or cranial nerve palsy … new onset diplopia (double vision) needs to be evaluated by an eye doctor.
why not add a link to the relevant video?
Fair enough … if you want to see a video lecture on esotropia, you might want to watch my tropia versus phoria lecture here:
http://www.ophthobook.com/videos/tropias-and-phorias-video