RT Book, Section
A1 Singh, Manpreet
A1 Whitfield, Denise
A2 Knoop, Kevin J.
A2 Stack, Lawrence B.
A2 Storrow, Alan B.
A2 Thurman, R. Jason
SR Print(0)
ID 1181038395
T1 Anisocoria
T2 The Atlas of Emergency Medicine, 5e
YR 2021
FD 2021
PB McGraw-Hill
PP New York, NY
SN 9781260134940
LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1181038395
RD 2024/04/23
AB Anisocoria  is  a  disparity  of  pupil  size.  To  determine  the  abnormal  pupil,  compare  pupil  sizes  in  light  and  dark.  It  is  accentuated  in  the  paretic  muscle.  If  the  iris  sphincter  (or  its  innervation)  is  involved,  the  anisocoria  will  be  increased  in  bright  light.  If  the  iris  dilator  muscle  (or  its  innervation)  is  affected,  it  will  be  more  pronounced  in  darkness.  Up  to  20%  of  normal  individuals  have  physiologic  anisocoria  of  1  to  2  mm.