Purpose: To study the rule of Visual Evoked Potential (VEP) in evaluation of patient with Idiopathic Intracranial Hypertension (IIH). Methods: The study was carried out on fifty-nine patients presented with IIH from February 2017 to the end November of 2018. All patients were subjected to complete medical, Ophthalmological and neurological history and examination, Lumbar Puncture (LP), VEP, perimetry and MRI brain and MRV were done. Result: We found that 35.59% of patients had prolonged P100 latency of VEP and 22.03% of patients had abnormal visual field. Also there were significant correlation between P100 latency of VEP and duration of disease, opining CSF pressure, and result of perimetry. Conclusion: We concluded that VEP is simple sensitive noninvasive method for evaluation of visual function in patients with ICH.