All are true about central retinal artery occlusion (CRAO) except?

Ans. (a) Most commonly occurs due to thromboembolism; (c) Sudden painful loss of visionRef: Kanski 7/e, p. 559, 563* Presentation is with sudden and profound loss of vision, Painless, except in Giant cell arteritis* Atherosclerosis related thrombosis at the level of lamina cribrosa is by far the most common underlying cause of CRAO, accounting for 80% cases