ObjectiveTo investigate the incidence and relevant factors of visual acuity abnormalities in preschool children undergoing kindergarten entrance physical examinations in Shannan City, Xizang, in 2022, so as to formulate policies for protecting children’s visual acuity and provide a basis for optimizing the children’s health service system in this region. MethodsA cross sectional study was conducted among the children undergoing kindergarten entrance physical examinations in Shannan City in 2022. A diopter examination was performed for these children, and a questionnaire survey was administered to their caregivers. Additionally, factors affecting children’s visual acuity abnormalities were analyzed using the χ² test and binary logistic regression analysis. ResultsA total of 759 children were included in the analysis, with an incidence rate for visual acuity abnormalities of 11.20%. Univariate analysis showed that statistically significant differences were observed in the incidence rate for visual acuity abnormalities among preschool children in terms of different family monthly income (χ²=17.395, P<0.001), father’s education level (χ²=5.133, P=0.023), postnatal vitamin A and D supplementation (χ²=9.575, P=0.008), and feeding method within the first 6 months after birth (χ²=9.330, P=0.009). Multivariate analysis results indicated that family monthly income <5 000 yuan (OR=2.599, P=0.003), insufficient postnatal vitamin A and D supplementation (OR=1.912, P=0.011), and formula feeding (OR=2.131, P=0.010) were relevant factors for abnormal visual development in children. ConclusionThe incidence of visual acuity abnormalities in preschool children in Shannan City is slightly higher than that previously reported in other regions of Xizang. The occurrence of visual acuity abnormalities in children is related to factors such as family monthly income, postnatal vitamin A and D supplementation, and feeding method within the first 6 months after birth. Future interventions should be strengthened on the promotion and dissemination of knowledge related to eye use, such as improve parental awareness of eye care, promote timely vitamin A and D supplementation and encourage breast feeding for children after birth, more specifically, attentions need to be focused on the visual acuity problems of children from low-income families to safeguard the visual health in preschool children in Shannan City, Xizang.

Objective To observe and analyze the disease,health status,and related factors of college students in Lhasa at a specific time point,so as to reveal the distribution characteristics of acute mountain sickness(AMS)and the correlation between TCM constitution and other variables in the target population.Methods A cross-sectional observational study design was adopted.Univariate analysis was conducted on the differences between groups in demographic and sociological indicators,physiological indicators,risk factors,TCM constitution,sleep quality,and psychological state,with the presence or absence of AMS as the grouping variable.Binary Logistic regression analysis was performed with variables with P<0.05 in univariate analysis as independent variables and the presence or absence of AMS as the dependent variable to explore the correlation between AMS and various influencing factors.Results A total of 415 valid questionnaires were recovered.The prevalence of AMS peaked at 43.55%within 24 hours after entering Tibet,showing an overall trend of first increasing and then decreasing.AMS was significantly correlated with pre-entry mood,time adaptation,anxiety state,and constitution.College students in a state of tension and fear were 4.84 times more likely to develop AMS than those with no change in mood(OR=4.84,95%CI:1.07～21.95,P=0.041).College students with anxiety were 2.21 times more likely to develop AMS than those without anxiety(OR=2.21,95%CI:1.23～3.99,P=0.008).In terms of constitution,when the Pinghe Constitution was used as the reference group,the combined constitution was significantly associated with the occurrence of AMS(OR=2.44,95%CI:1.16～5.16,P=0.019).Among the eight biased constitutions,the prevalence of AMS in qi-deficiency constitution was 2.06 times that in non-qi-deficiency constitution(95%CI:1.05～4.06,P=0.036).In terms of time adaptation,the stages of 72～96 hours and 96～120 hours after arriving in Lhasa had P<0.05,with OR values of 0.38(95%CI:0.15～0.99)and 0.30(95%CI:0.13～0.66),respectively.Conclusion The main risk factors for AMS in college students in Lhasa are related to anxiety,pre-entry mood,and constitution,and the adaptation time of 72 hours is a protective factor for AMS.