June 2007
Volume 7, Issue 9
Free
Meeting Abstract  |   June 2007
Crowding accounts for the limits of amblyopic reading
Author Affiliations
  • Denis Pelli
    Psychology and Neural Science, New York University
  • Shuang Song
    School of Optometry, University of California at Berkeley
  • Dennis Levi
    School of Optometry, University of California at Berkeley, and Helen Wills Neuroscience Institute, University of California at Berkeley
Journal of Vision June 2007, Vol.7, 519. doi:10.1167/7.9.519
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      Denis Pelli, Shuang Song, Dennis Levi; Crowding accounts for the limits of amblyopic reading. Journal of Vision 2007;7(9):519. doi: 10.1167/7.9.519.

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      © 2015 Association for Research in Vision and Ophthalmology.

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Abstract

Might the impairment of reading in amblyopia be a consequence of increased crowding (i.e. larger critical spacing)? We measured the reading rate of amblyopes as a function of letter spacing in central and peripheral vision. From these results, we estimate the “critical spacing for reading” (similar to critical print size). We find that the amblyopic reading deficit is large but very specific. Peripheral reading is unaffected. Central reading has greatly increased critical spacing, but normal maximum reading rate. We compared the critical spacing for reading with the observers' letter acuity and the critical spacing for identifying a letter among flankers, which is the classic measure of crowding (Bouma, 1970). For both normals and amblyopes, in both central and peripheral vision, we find that the critical spacing for reading equals the critical spacing for crowding.

Pelli, D. Song, S. Levi, D. (2007). Crowding accounts for the limits of amblyopic reading [Abstract]. Journal of Vision, 7(9):519, 519a, http://journalofvision.org/7/9/519/, doi:10.1167/7.9.519.
Footnotes
 EY04432, EY01728
© 2007 ARVO
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