What is the difference between double vision and ghosting?

Muscle imbalance: Double vision is due to the eyes pointing in different directions. Cover either eye and the image becomes single. Ghosting is typically due to astigmatism. It goes away by looking through a pin hole in a piece of cardboard, or proper glasses or contacts. If one eye is covered and there is still double the astigmatism is strong, if there is just ghosting the astigmatism is mild.

The image!: In double vision, there are two distinct images. This is common with misaligned eyes, but can be seen with single eye as well (such as slipped lens). Ghosting is like the old tvs when the announcer had an image outlining his image. Ghosting is a single eye issue due to astigmatism, cataract, corneal scar...