title: The impact of central sparing on the word-length effect in hemianopia.
abstract: Studies suggest that a word-length effect of up to 160 ms/letter distinguishes hemianopic dyslexia from pure alexia. However, partial preservation of central vision is common in right hemianopia, but its effects on single-word reading are unknown. Eighteen healthy subjects read single words with a gaze-contingent right hemianopia simulation that varied the degree of central sparing. Mean reading onset time declined with small degrees of central sparing, but the word-length effect did not decrease until sparing exceeded 3.15°. We next evaluated the effects of font size. Effects of central sparing were constant when expressed in number of letters, with a decline in word-length effect beginning as sparing approached 4 letters. We conclude that the effects of central sparing on mean reading onset time and the word-length effect are distinct. We provide diagnostic word-length criteria for discriminating between pure alexia and hemianopic dyslexia with various degrees of central sparing.
authors.affiliation: a Human Vision and Eye Movement Laboratory , Departments of Medicine (Neurology) , Vancouver , BC , Canada.|b Ophthalmology and Visual Sciences , University of British Columbia , Vancouver , BC , Canada.
authors.forename: Cristina
authors.initials: C
authors.lastname: Rubino
authors.affiliation: a Human Vision and Eye Movement Laboratory , Departments of Medicine (Neurology) , Vancouver , BC , Canada.|b Ophthalmology and Visual Sciences , University of British Columbia , Vancouver , BC , Canada.
authors.forename: Shanna C
authors.initials: SC
authors.lastname: Yeung
authors.affiliation: a Human Vision and Eye Movement Laboratory , Departments of Medicine (Neurology) , Vancouver , BC , Canada.|b Ophthalmology and Visual Sciences , University of British Columbia , Vancouver , BC , Canada.
authors.forename: Jason J S
authors.initials: JJS
authors.lastname: Barton
mesh_terms: D000328:Adult; D004410:Dyslexia / Q000628:therapy*; D005260:Female; D006423:Hemianopsia; D006801:Humans; D008297:Male; D011932:Reading
keywords: Alexia; font; hemianopic dyslexia; macular sparing; reading