Psychophysics of reading XX. Linking letter recognition to reading speed in central and peripheral vision

  title={Psychophysics of reading XX. Linking letter recognition to reading speed in central and peripheral vision},
  author={Gordon E. Legge and John Stephen Mansfield and Susana T. L. Chung},
  journal={Vision Research},
Developmental changes in the visual span for reading
Letter-recognition and reading speed in peripheral vision benefit from perceptual learning
The case for the visual span as a sensory bottleneck in reading.
The size of the visual span and reading speed showed the same qualitative dependence on character size and contrast, reached maximum values at the same critical points, and exhibited high correlations at the level of individual subjects.
Effect of letter spacing on visual span and reading speed.
The size of the visual span and the reading speeds measured by the two presentation methods showed a qualitatively similar dependence on letter spacing and that they were highly correlated, consistent with the view that the size ofThe visual span is a primary visual factor that limits reading speed.
The effect of letter spacing on reading speed in central and peripheral vision.
Examining whether reading speed can be improved in normal peripheral vision by increasing the letter spacing found increased letter spacing beyond the standard size does not lead to an increase in reading speed in central or peripheral vision.
Dependence of Reading Speed on Letter Spacing in Central Vision Loss
  • Susana T. L. Chung
  • Physics
    Optometry and vision science : official publication of the American Academy of Optometry
  • 2012
Increased letter spacing beyond the standard size, which presumably reduces crowding among letters in text, does not improve reading speed for people with central vision loss and the optimal letter spacing for reading can be predicted based on the preferred retinal locus.
Sensory factors limiting horizontal and vertical visual span for letter recognition.
It is concluded that crowding is the major factor limiting the size of the visual span, and that the horizontal/vertical difference in thesize of theVisual span is associated with stronger crowding along the vertical midline.


Psychophysics of reading. XVIII. The effect of print size on reading speed in normal peripheral vision
Psychophysics of reading—XVI. The visual span in normal and low vision
Visual Requirements for Reading
The research indicates that fluent reading rates can be attained with a restricted field of view, as little as four characters, however, attainment of fluent reading levels requires that print size and contrast should be several times threshold and the diameter of a central scotoma should be less than 22°.
Low vision reading with sequential word presentation