Diagnostic value of optical coherence tomography in patients with idiopathic intracranial hypertension

BackgroundIdiopathic intracranial hypertension (IIH) is characterized by raised intracranial pressure in the absence of space-occupying lesions or other known etiology. It mainly affects young obese women, and may cause visual loss due to secondary optic atrophy.ObjectiveThe aim of the study was to investigate optical coherence tomography (OCT) and perimetry changes in patients with IIH at admission and 6 months later and highlight the relationship between OCT changes and severity of visual dysfunction measured by automated perimetry.Patients and methodsThis study included 30 female patients with IIH. Cerebrospinal fluid opening pressure was recorded. Complete ophthalmic evaluation included assessment of best-corrected visual acuity, perimetry, and retinal nerve fiber layer (RNFL) and ganglion cell complex (GCC) thickness within 3-4 days of performing the lumbar puncture. Thirty age-matched healthy women underwent a similar ophthalmological evaluation.ResultsIn IIH patients the initial RNFL thickness was significantly higher, whereas GCC was significantly lower than that of controls (P = 0.045 and 0.004, respectively). The value of intracranial pressure measured was found to be positively correlated with the stage of papilledema (r = 0.494, P = 0.000). The final recordings showed significant decrease in GCC and RNFL values (P = 0.000 and 0.002, respectively) and improvement in mean deviation (P = 0.003).ConclusionGCC and RNFL thickness abnormalities in IIH patients were quantitatively correlated with visual field sensitivity losses. OCT is an effective tool for quantifying parameters of optic nerve damage.