August 2016
Volume 16, Issue 12
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2016
Effects of Length of Reading Materials on Key Parameters of Reading Speed Function
Author Affiliations
  • Koichi Oda
    Tokyo Woman's Christian University
  • Madoka Ohnishi
    Tokyo Woman's Christian University
  • Terumi Otsukuni
    Tokyo Woman's Christian University
  • Aoi Takahashi
    Tokyo Woman's Christian University
  • Michiko Sugiyama
    Tokyo Woman's Christian University
  • Seiji Yamagami
    Senshu University
Journal of Vision September 2016, Vol.16, 1421. doi:
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      Koichi Oda, Madoka Ohnishi, Terumi Otsukuni, Aoi Takahashi, Michiko Sugiyama, Seiji Yamagami; Effects of Length of Reading Materials on Key Parameters of Reading Speed Function. Journal of Vision 2016;16(12):1421.

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose: Reading evaluation has been gradually accepted as a clinically important vision test in low vision rehabilitation. There are several versions and reading materials varies from unrelated random words to a paragraph of text (approx. 130 words). Purpose of this paper is to investigate into the effect of length of reading materials on two key parameters, location of reading function(LRF) which is closely related to critical print size(CPS) and maximum reading speed(MRS). Methods: In one experiment, reading materials were both 4-character clauses and 30-character sentences in Japanese. In the other experiment, they were random combinations of a Kanji and a Kana, 4-character clauses, and 10-character short sentences. In an experimental session, one type of reading material was tested. Different reading content was presented in each trial and participants were asked to read aloud as quickly and precisely as possible. A session started with the largest character size of 61.93 min of arc and proceeded to 0.1 log smaller trials until no single character was read. Reading time and errors were recorded and reading speed function was plotted for each reading material condition. Two parameters were estimated using Weibull fitting. Thirty three Japanese for one experiment and 28 for the other participated and all had corrected/uncorrected normal visual acuity. Results and Discussion: Combining results of two experiments, there was a moderately good agreement in LRF estimates among different reading material conditions with 0.5 through 0.7 correlations. As for MRS, there was a very systematic increase along with the length of reading material. We conducted a mixed effect model analysis on MRS data with a model, reading time (msec) = latency + unit reading time (msec/char) x character length. The model fit well (R2=0.99). We conclude that these findings help us compare and convert results of different reading evaluations.

Meeting abstract presented at VSS 2016


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