All are true about central retinal aery occlusion (CRAO) except

Answer- C. Sudden painful loss of visionPatient notices sudden painless loss of vision.Patients's with a patent cilioretinal aery may retain central vision as the macula is spared.Emboli are the most common cause of retinal aery occlusion.Obstruction occurs at the level of lamina cribrosa.The larger retinal aeries are constuicted and look like thin threads while the smaller vessels are scarcely visible.The fundus appears milky white because of retinal edema.There is cherry-red spot at the macula.Blood column within the retinal veins is segmented (Cattle tracking)