RT Book, Section
A1 Hamill, Eric B.
A1 Marx, Douglas P.
A2 Kline, Mark W.
SR Print(0)
ID 1182926788
T1 Lid and Lacrimal System Disorders
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=1182926788
RD 2024/04/25
AB The  eyelids  are  an  important  part  of  the  ocular  adnexa.  They  provide  a  mechanical  barrier  against  the  environment,  distribute  the  tear  film,  and  remove  debris  from  the  ocular  surface.  In  the  normal  eyelid,  the  margins  should  be  symmetric  and  parallel  to  one  another.  The  upper  margin  should  rest  1  to  2  mm  below  the  superior  edge  of  the  cornea,  and  the  lower  margin  should  rest  at  the  inferior  edge  of  the  cornea.  Generally,  the  lateral  canthus  is  positioned  approximately  1  mm  higher  than  the  medial  canthus,  giving  a  slight  upward  slant  to  the  palpebral  fissure  as  one  moves  laterally.