Editing Amblyopia (section)

==Signs and symptoms==
Many people with amblyopia, especially those who only have a mild form, are not aware they have the condition until tested at older ages, since the vision in their stronger eye is normal. People with amblyopia typically have poor [[stereopsis|stereo vision]], since it requires both eyes. They further may have, on the affected eye, poor pattern recognition, poor [[visual acuity]], and low sensitivity to [[contrast (vision)|contrast]] and [[Motion perception|motion]].<ref name="Hess">{{cite journal | vauthors = Hess RF, Mansouri B, Dakin SC, Allen HA | title = Integration of local motion is normal in amblyopia | journal = Journal of the Optical Society of America A | volume = 23 | issue = 5 | pages = 986–92 | date = May 2006 | pmid = 16642175 | doi = 10.1364/JOSAA.23.000986 | bibcode = 2006JOSAA..23..986H }}</ref>

Amblyopia is characterized by several functional abnormalities in spatial vision, including reductions in [[visual acuity]], [[contrast sensitivity]] function, and [[vernier acuity]], as well as spatial distortion, abnormal spatial interactions, and impaired contour detection. In addition, individuals with amblyopia have binocular abnormalities such as impaired stereoacuity ([[stereoscopic acuity]]) and abnormal [[binocular summation]].<ref name="polat"/> Also, central vision in amblyopes is more [[crowding|crowded]] than central vision in normal observers.<ref name="LeviSong2007">{{cite journal|last1=Levi|first1=Dennis M.|last2=Song|first2=Shuang|last3=Pelli|first3=Denis G.|title=Amblyopic reading is crowded|journal=Journal of Vision|volume=7|issue=2|year=2007|pages=21.1–17|issn=1534-7362|doi=10.1167/7.2.21|pmid=18217836|doi-access=free}}</ref>

These deficits are usually specific to the amblyopic eye. Subclinical deficits of the "better" eye have also been demonstrated.<ref>{{cite journal | vauthors = Simons K | title = Amblyopia characterization, treatment, and prophylaxis | journal = Survey of Ophthalmology | volume = 50 | issue = 2 | pages = 123–66 | year = 2005 | pmid =  15749306| doi = 10.1016/j.survophthal.2004.12.005 }}</ref>

People with amblyopia also have problems of [[binocular vision]] such as limited stereoscopic [[depth perception]] and usually have difficulty seeing the three-dimensional images in hidden stereoscopic displays such as [[autostereogram]]s.<ref name="Tyler">{{Cite book |  vauthors = Tyler CW| year=2004| title= Binocular Vision In, Duane's Foundations of Clinical Ophthalmology | volume = 2 | veditors = Tasman W, Jaeger EA | publisher = J.B. Lippincott Co. | location = Philadelphia }}</ref> Perception of depth, from monocular cues such as size, [[Perspective (visual)|perspective]], and [[Parallax|motion parallax]] remains normal.