I have heard Meniere's referred to as "glaucoma of the ear". Is it equivalent and can treatments used for glaucoma be used to treat Meniere's?

Meniere's disease is absolutely not equivalent to glaucoma of the eye. Endolymph has a totally different composition to the fluid in the anterior chamber of the eye and is maintained by completely different mechanisms. In addition, glaucoma is usually associated with high pressure in the eye, which may impair blood flow to the retina. Endolymphatic hydrops develops without any increase in endolymph or perilymph pressures, so there is no pressure-induced disturbance of cochlear blood flow. Comparing Meniere's with glaucoma is like comparing roast beef and apple pie.