This is a single center, prospective study to calculate cerebrospinal fluid pressure (CSFp) using a non-invasive device and assess its role in the development of optic neuropathy due to glaucoma or idiopathic intracranial hypertension (IIH). The study also aims to assess whether CSFp differs between untreated and treated patients with glaucoma, ocular hypertension, IIH, and other ocular diseases that may be associated with CSFp differences.