RT Book, Section
A1 Gappy, Christopher
A1 Hoehn, Mary Ellen
A1 Del Monte, Monte A.
A2 Kline, Mark W.
SR Print(0)
ID 1182926134
T1 Strabismus
T2 Rudolph's Pediatrics, 23e
YR 2018
FD 2018
PB McGraw-Hill Education
PP New York, NY
SN 9781259588594
LK accesspediatrics.mhmedical.com/content.aspx?aid=1182926134
RD 2024/04/19
AB Strabismus  is  the  term  used  to  describe  any  ocular  misalignment.  The  term  originates  from  the  Greek  strabismus,  meaning  to  “look  askance”  or  the  “evil  eye.”  Ocular  misalignment  that  is  constantly  present  and  not  controlled  by  fusional  mechanisms  is  termed  a  tropia.  A  phoria  is  defined  as  a  latent  deviation  that  is  controlled  by  fusional  mechanisms  and  only  presents  when  1  eye  is  blocked  or  covered.  An  intermittent  tropia  is  a  deviation  that  may  sometimes  be  latent  and  controlled  by  fusional  mechanisms  (ie,  a  phoria)  but  may  at  other  times  be  spontaneously  manifest,  often  with  illness  or  fatigue.  Most  children  with  strabismus  develop  a  deviation  that  manifests  mostly  in  1  eye  (the  nondominant  eye).  Some  strabismic  children  are  able  to  switch  fixation,  using  1  eye  at  times  and  the  other  eye  at  other  times,  so  that  the  strabismus  will  appear  to  shift  from  1  eye  to  the  other.  This  is  termed  alternating  strabismus.  In  some  children,  strabismus  develops  as  a  result  of  poor  vision  in  1  eye  and  is  termed  sensory  strabismus.  Strabismus  may  also  be  the  presenting  sign  of  a  life-threatening  disease  (eg,  brain  tumors  with  cranial  nerve  palsy)  or  vision-threatening  conditions  such  as  retinoblastoma  or  cataract.