Low Vision Children's Large Textbook Text Setting Standards

In the daily learning process,low vision children can use their eyes to read as well as normal children.Printed textbooks are the main carrier of learning knowledge for low vision children.It has been proved that the characters of the text and the layout of the reading carrier have different effects on the reading performance.However,the results of the research on the influence of font size and text spacing on the text reading are not consistent,and the research on the layout of the text page is also inadequate.Therefore,this study investigated the effects of different text factors on reading in low vision children,combined with eye movement technique and low vision children's reading performance.Three experiments were designed in this study:In the first experiment,a 3(font types:Song,Hei,Kai)× 4(font sizes:4,3,2,1)two-factor within-subject repeated experiment is designed to examine the effects of font size and font type on Chinese reading in low-vision children.The format of the experimental materials is:black page background,white font,1 times line spacing and standard word spacing,top margin 2.54cm,left and right margins 3.18cm.In the second experiment,a 3(line space:single,1.5 times,2 times)× 3(word space:standard,1/2 times,1 times)two-factor within-subject repeated experiment is designed to exlplore the effects of different line space and word space on Chinese reading in low-vision children.The experimental material is setted as:black page background,white font,blackbody No.two word,upper margin 2.54cm,left and right margins 3.18cm.In the third experiment,a single factor experiment is designed in order to explore the effects of different margins on Chinese reading in low-vision children.The format of experimental material is:black page background,white font,blackbody No.two word,2 times the line spacing and 1 times the word spacing,upper margin 2.54cm,left and right margins 3.18cm.The first study found that,(1)there were differences in the reading index between different font types and font sizes texts.Reading speed of arial No.four word was the slowest and reading efficiency of it was the lowest.(2)There existed differences in the eye movement indexes between different font types and font sizes of texts.In the total fixation duration,Hei No.two word was the least;in the total number of fixation,Hei No.two word was the least.The second study found that,(1)there were differences in the reading index between different line spacing and words spacing texts.2 times the line spacing and 1/2 times the word spacing or 2 times the line spacing and 1 times the word spacing had the fastest reading speed and the highest reading efficiency.(2)There were differences in the eye movement index between line spacing texts and word spacing texts.2 times the line spacing and 1/2 times the word spacing or 2 times the line spacing and 1 times word spacing texts had the shortest total fixation time and the least total number of fixation.It can be seen that the expansion of the text spacing improves the reading score and reading speed,but the extent of the text spacing is limited,and the large text spacing is not conducive to reading.The third study found that,(1)there were differences in the reading index between different margins texts.The text reading speed of 3.18cm margins was the fastest;reading efficiency of 1.91cm margins was significantly slower than the margins of 3.18cm text.(2)There were differences in the eye movement index between different margins texts.In the total fixation duration,the margin of 1.91cm text was the least;in the total number of fixation,the margin of 1.91cm text was the least.As can be seen,the most effective textual condition for low vision children is to have a larger text width.