RT Book, Section
A1 Effron, David
A1 Forcier, Beverly C.
A1 Wyszynski, Richard E.
A2 Knoop, Kevin J.
A2 Stack, Lawrence B.
A2 Storrow, Alan B.
A2 Thurman, R. Jason
SR Print(0)
ID 1181039706
T1 Anterior Ischemic Optic Neuropathy
T2 The Atlas of Emergency Medicine, 5e
YR 2021
FD 2021
PB McGraw-Hill
PP New York, NY
SN 9781260134940
LK accessmedicine.mhmedical.com/content.aspx?aid=1181039706
RD 2024/04/19
AB Anterior  ischemic  optic  neuropathy  (AION)  presents  with  a  sudden  loss  of  visual  field  (often  altitudinal),  usually  involving  fixation,  in  an  older  individual.  The  loss  is  usually  stable  after  onset,  with  no  improvement,  and  only  occasionally,  progressive  over  several  days  to  weeks.  In  contrast  to  the  hyperemic  appearance  that  usually  accompanies  optic  nerve  head  edema,  pale  disk  swelling  is  present  involving  a  sector  or  the  full  disk,  sometimes  with  accompanying  flame  hemorrhages.  The  cup-to-disk  ratio  is  typically  small  (0.1-0.2)  bilaterally.