Clinical Research Directory

ICP & Outflow Study

This study aims to investigate the relationship between intracranial pressure (ICP) and aqueous outflow (the flow of the eye's internal fluid out of the eye), in patients with increased intracranial pressure (idiopathic intracranial hypertension (IIH)). Through observing changes in aqueous outflow facility in patients scheduled for lumbar Puncture (LP) as part of their routine care the objectives we aim to answer include: * Investigating the effect of lumbar puncture induced reduction in ICP on patients with known or suspected IIH, compared to control patients, who will be receiving LP for reasons not pertaining to high pressure. * Comparing pre lumbar puncture aqueous outflow facility between patients with idiopathic intracranial hypertension and control patients. Outside of the standard care provided for these patients as part of their scheduled lumbar puncture, they will have measurements of their eye taken before and after their lumbar puncture.