Bandage lenses are not a dry eye treatment per se.
Bandage lenses (and yes they are just ordinary soft lenses but used as a bandage rather than for vision) are usually used after corneal surgery to aid in surface healing, and they're also used to protect the eye while healing from an injury. They drape over the cornea and shield it and help keep it from drying out too badly. In some special situations they're used by dry eye patients especially if they get corneal erosions at night. Some people with dry eye can tolerate them and some can't.
The Dry Eye Zone