Epley's test is used for which of the following conditions?

Benign paroxysmal positional veigo (BPPV) is characterised by veigo when the head is placed in a ceain critical position. There is no hearing loss or other neurologic symptoms. Disease is caused by a disorder of posterior semicircular canal. The condition can be treated by performing Epley's manoeuvre. The principle of this manoeuvre is to reposition the otoconial debris from the posterior semicircular canal back into the utricle.