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Objective To investigate the visual acuity condition of preschool children in Yangpu District of Shanghai, providing the basis for formulation of corresponding intervention measures for myopia. Methods The inspection equipment was the international standard logarithmic E-word visual acuity chart, and the Canon RK-F1 automatic computer optometry instrument.By using cross-sectional study and random cluster sampling method, a total of 1 415 preschool children in 5 kindergartens in Yangpu District were selected according to their ages and genders, and their visual acuity and refractive parameters were examined with the result being statistically analyzed. Results In preschool children of Yangpu District, their envisage rate was 80.4%, myopia rate 16.7% and hyperopia rate 2.9%.There was no significant difference in the incidence rate of envisage, myopia and hyperopia between different age groups (χ2=3.419, P=0.755) and different genders (χ2=2.433, P=0.296).The rate of poor vision for preschool children in Yangpu was 10.5%.There was a statistically significant difference in the rate of poor vision between different age groups (χ2=9.637, P=0.022) and different genders (χ2=4.191, P=0.041). Conclusion The visual acuity rate and myopia rate in preschool children are not optimistic and need further screening and early intervention.
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Objective To investigate the visual acuity condition of preschool children in Yangpu District of Shanghai, providing the basis for formulation of corresponding intervention measures for myopia. Methods The inspection equipment was the international standard logarithmic E-word visual acuity chart, and the Canon RK-F1 automatic computer optometry instrument.By using cross-sectional study and random cluster sampling method, a total of 1 415 preschool children in 5 kindergartens in Yangpu District were selected according to their ages and genders, and their visual acuity and refractive parameters were examined with the result being statistically analyzed. Results In preschool children of Yangpu District, their envisage rate was 80.4%, myopia rate 16.7% and hyperopia rate 2.9%.There was no significant difference in the incidence rate of envisage, myopia and hyperopia between different age groups (χ2=3.419, P=0.755) and different genders (χ2=2.433, P=0.296).The rate of poor vision for preschool children in Yangpu was 10.5%.There was a statistically significant difference in the rate of poor vision between different age groups (χ2=9.637, P=0.022) and different genders (χ2=4.191, P=0.041). Conclusion The visual acuity rate and myopia rate in preschool children are not optimistic and need further screening and early intervention.
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70 bpm during scan),the proportion of segments that could not be assessed because of motion artifact were 0.1%(1/759),1.1%(7/649),2.5% (10/407),42.6%(103/242),and 75.5%(108/143),respectively.With conventional selective coronary angiography as the golden standard,the sensitivity,specificity,positive and negative prediction values to detect≥50% stenotic lesions in the assessable segments were 79.2%,96.0%,83.8%,and 94.6%,respectively.There was a significant correlation between the number of segments per patient not assessable because of motion artifact and heart rate during the scan(r=0.655,P=0.000).Conclusion MSCT is capable of achieving high accuracy for detection of coronary artery stenosis,and is a reliable technique to diagnose coronary artery disease.