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Objectives To explore the effects of visual tasks added in physical activities on kinetic and static visual acuity for 6-9 years old children.Methods Children's visual function and seeing activity were analyzed and four kinds of physical activities with visual tasks were designed. From June to August, 2018, 38 pupils from a sports summer camp aged 6 to 9 years with normal vision participated in the eight-week training. Their kinetic and static visual acuity was measured before, four weeks, and eight weeks after training.Results Both kinetic and static visual acuity improved after training (F＞ 24.368, P ＜ 0.001), and the binocular static visual acuity improved more in the boys than in the girls (t＞ 2.161, P ＜ 0.05). There was a moderate positive correlation among kinetic and static visual acuity (r＞ 0.424, P ＜ 0.01).Conclusion Physical activities with visual tasks are beneficial for kinetic and static visual acuity for children aged 6-9 years, which may be an approach to promote vision health.
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Objective:To observe the effect of football, badminton and table tennis on kinetic visual acuity for children in grade one to three at elementary schools. Methods:From February to June, 2019, A total of 123 children aged seven to nine years from four elementary schools were divided into control group (n = 32), badminton group (n = 33), table tennis group (n = 30) and football group (n = 28). The children in the experimental groups accepted ball playing training for 16 weeks, while the control group did not attended any training course. The kinetic visual acuity was measured before and after training. Results:The kinetic visual acuity improved after training in the experimental groups (t > 2.196, P < 0.05), but not in the control group (t = 1.570, P > 0.05). The rates of improvement of kinetic visual acuity were: football (26.82%), badminton (25.44%) and table tennis (19.21%). Conclusion:The ball games play a positive role in improving kinetic visual acuity for children in junior grades, especially the big ball games.
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Objective:To investigate the impact of age and gender on kinetic visual acuity (KVA) and static visual acuity (SVA) in school children accepting physical activities. Methods:From May, 2018 to September, 2019, 1465 school children from various schools of Suzhou City were measured SVA and KVA with standard logarithmic visual chart and KVA detector. Results:KVA increased with age as six to nine years old, and decreased as eleven to 14. KVA was better in boys than in girls (t = 5.147, P < 0.001). SVA decreased with age as six to eight years old, fluctuated as eight to eleven, and decreased as eleven to 14, especially for girls. SVA was also better in boys than in girls (t = 3.692, P < 0.001). The prevalence of myopia increased with age as six to eight years old, and increased more significantly as eleven to 14. There was a low positive correlation between age and KVA (r = 0.046, P < 0.05), and a moderate negative correlation between age and SVA (r = -0.364, P < 0.05). KVA was positively correlated with SVA (r = 0.409, P < 0.05). Age, gender, KVA, right SVA and left SVA were the factors related with SVA. Conclusion:Vision is better in school boys than in girls. There is positive correlation between age and KVA. It is necessary to develop physical exercise according to age and gender to improve vision development, especially at the sensitive stage of visual function.
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@#Objective To investigate the developmental characteristics of static visual acuity (SVA) and kinetic visual acuity (KVA) and the correlation between the for children. Methods From April to June, 2018, SVA and KVA of 715 children aged 6 to 10 years in Suzhou were tested with logarithmic visual chart and KVA meter. Results KVA and SVA increased with age within 6 to 9 years old, and decreased then. KVA was higher in boys than in girls (t = 4.604, P < 0.001), but not significantly different for SVA (t = 1.822, P > 0.05). There was a moderate positive correlation between KVA and SVA (r = 0.552, P < 0.01). KVA can predicted SVA (B = 0.617, P < 0.001). Conclusion KVA and SVA develop for children aged 6 to 9, and moderately positive correlate with each other. It means SVA may be improved via training of KVA.
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We carried out tests of visual functions and evaluated the effects of the correction of visual acuity on kinetic visual acuity (KVA) in 21 high school rugby players. KVA during sports activities was highly correlated with binocular vision (r=0.719, p<0.0001) and static visual acuity (SVA) (r =0.798, p<0.0001) . When binocular vision, SVA, and KVA during sports activities were compared after correction, they all significantly improved after correction (binocular vision: 0.78±0.39→1.46 ±0.26, p<0.0001 ; SVA : 0.86±0.48→1.31±0.25, p<0.01 ; KVA : 0.54±0.350.75±0.20, p <0.05) . Moreover, significant negative correlations were observed among binocular vision, SVA, and KVA and the percent improvement after correction (r=-0.755, r=-0.848, r=-0.829, respectively ; all p<0.001) . The percentage of KVA to SVA was 64.0±21.7% during sports activities and 59.1±16.7% after correction decreasing slightly with correction, though not significantly. Therefore, KVA, which plays an important role in sports activities, improved as SVA improved, and poor KVA is thought to improve to an adequate level by correction of visual acuity. However, the effect of a correction was smaller in KVA than in SVA, and KVA deteriorated with over-correction in some players. Further studies are needed concerning the criteria for correction to obtain good KVA and the relationship between correction and training.