Editing Visual system (section)

===Infancy===
{{See also|Infant vision}}
Newborn infants have limited [[color perception]].<ref name="Lane2012">{{cite book|last=Lane|first=Kenneth A.|title=Visual Attention in Children: Theories and Activities|url=https://books.google.com/books?id=FdVDkAOK_WUC&pg=PA7|access-date=4 December 2014|year=2012|publisher=SLACK|isbn=978-1-55642-956-9|page=7}}</ref> One study found that 74% of newborns can distinguish red, 36% green, 25% yellow, and 14% blue. After one month, performance "improved somewhat."<ref name="AdamsCourage1994">{{cite journal|last1=Adams|first1=Russell J.|last2=Courage|first2=Mary L.|last3=Mercer|first3=Michele E.|title=Systematic measurement of human neonatal color vision|journal=Vision Research|volume=34|issue=13|year=1994|pages=1691–1701|issn=0042-6989|doi=10.1016/0042-6989(94)90127-9|pmid=7941376|s2cid=27842977}}</ref> Infant's eyes do not have the ability to [[accommodation (eye)|accommodate]]. Pediatricians are able to perform non-verbal testing to assess [[visual acuity]] of a newborn, detect [[nearsightedness]] and [[astigmatism]], and evaluate the eye teaming and alignment. Visual acuity improves from about 20/400 at birth to approximately 20/25 at 6 months of age. This happens because the nerve cells in the [[retina]] and brain that control vision are not fully developed.