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This paper is attempted to describe the effects of TV-teletext
and speech on visual fatigue and plot perception. There were 4
different conditions among language spoken and teletext showed,
and were tested on 20 sampling subjects in this experiment.
These 4 conditions were:1.Mandarin without teletext 2.Mandarin
with teletext 3.English without teletext 4. English with
teletext. Before and after each experiment, CFF(Critical Fusion
Frequency) and VT(Visual Treshold) were measured on each
subject. After the experiment were finished, subjects had been
asked to fill in the questionnaires to evaluate the plot
perception. During the 90 minute continueous watching, the
blink rate and eye movement were examined. Results of the
research were as follows: First: The effect of teletext used
and speech spoken on the plot perception were very significant,
and the respective Pr value of them equals to 0.0001. The
preference ranking order was Mandarin without teletext,Mandarin
with teletext,English with Chinese teletext and English without
teletext. Second:The effects of teletext used and speech spoken
on visual treshold were insignificant. Third:The effects of all
4 conditions as well as English spoken with teletext condition
and English spoken without teletext condition, on the critical
fusion frequency, were very significant,and the Pr order for
them were respectively as 0.0001, 0.0228,0.0292. Forth: The
effects of all 4 conditions and English spoken with teletext on
the blink rate were decreased at the end of the experiment,and
the Pr order was 0.0117, 0.0238. Fifth: The effect of condition
with teletext was significant either to the Saccade of the
eyeballs,average moving distance, average horizontal moving
distance, average vertical moving distance, moving distance per
minute, horizontal moving distance per minute, and vertical
moving distance per minute of the eyeballs. No effect of speech
had been found significant in the measurement.
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