<prompt> All of them are true in ocular ischemic syndrome exceptIt occurs when the carotid aery obstruction reaches 90Dull pain in orbital region which worsens on getting upDelayed recovery of vision following bright light exposure is seenNVI is never seen  <response>: Ocular ischaemic syndromeOIS results from chronic ocular hypoperfusion secondary to severe more than 90 ipsilateral atherosclerotic carotid stenosis.It typically affects older patients and may be associated with diabetes, hypeension, cardio-and cerebrovascular disease. 1. Symptoms are: Gradual loss of vision or sometimes amurosis fugax. Dull orbital pain worsens on getting up as perfusion fuhur decreases. Delayed recovery of vision following bright light exposure is seen known as bright light amurosis fugax. 2. NVI ocurrs in 90 cases in ocular ischemic syndrome. 