Rapporto d'aspetto: differenze tra le versioni

I limiti esterni della vista periferica di ogni occhio, rispetto al punto che viene fissato, si possono individuare nei termini di quattro angoli rappresentati le quattro direzioni cardinali. Questi angoli sono 60° superiore, 60° nasale (interno, verso il naso), 70°&ndash;75° inferiore e 100°&ndash;110° temporale (esterno, verso la tempia)<ref name="Traquair">>{{cite book |last= Traquair |first = Harry Moss |date= 1938 |title= An Introduction to Clinical Perimetry, Chpt. 1 |location= London|publisher= Henry Kimpton |pages = 4–5}}</ref><ref name="SavinoDanesh-Meyer2012">{{cite book|last1=Savino|first1=Peter J.|last2=Danesh-Meyer|first2=Helen V.|title=Color Atlas and Synopsis of Clinical Ophthalmology -- Wills Eye Institute -- Neuro-Ophthalmology|url=http://books.google.com/books?id=6RgSZGWQZGIC&pg=PA12|accessdate=9 November 2014|date=1 May 2012|publisher=Lippincott Williams & Wilkins|isbn=978-1-60913-266-8|page=12}}</ref><ref name="RyanSchachat2012">{{cite book|last1=Ryan|first1=Stephen J.|last2=Schachat|first2=Andrew P.|last3=Wilkinson|first3=Charles P. |author4=David R. Hinton |author5=SriniVas R. Sadda |author6=Peter Wiedemann|title=Retina|url=http://books.google.com/books?id=PdAsuzFRv5oC&pg=PT342|accessdate=9 November 2014|date=1 November 2012|publisher=Elsevier Health Sciences|isbn=1-4557-3780-1|page=342}}</ref><ref name="TrattlerKaiser2012">{{cite book|last1=Trattler|first1=William B.|last2=Kaiser|first2=Peter K.|last3=Friedman|first3=Neil J.|title=Review of Ophthalmology: Expert Consult - Online and Print|url=http://books.google.com/books?id=AazA_9TQnHYC&pg=PA255|accessdate=9 November 2014|date=5 January 2012|publisher=Elsevier Health Sciences|isbn=1-4557-3773-9|page=255}}</ref><ref>{{cite book|last1=Howard|first1=Ian P.|last2=Rogers|first2=Brian J.|title=Binocular vision and stereopsis|date=1995|publisher=Oxford University Press|location=New York|isbn=0-19-508476-4|page=32|url=http://books.google.com/books?id=I8vqITdETe0C&lpg=PA32&ots=JhaI-4InNv&pg=PA32|accessdate=3 June 2014}}</ref>.