Frisén stages of papilloedema. Frisén stages of papilloedema. Five fundus photos showing the various stages of papilloedema. (A) Grade 1: Obscured nasal disc border. (B) Grade 2: Obscuration of all borders with halo. (C) Grade 3: Obscuration of a segment of blood vessel. (D) Grade 4: Total obscuration of one of the blood vessels on the disc head. (E) Grade 5: Dome-shaped protrusion with obscuration of vessels of the entire optic disc. John H Pula, and Carlen A Yuen Stroke Vasc Neurol 2017;svn-2017-000079 © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.