A population-based study of visual impairment among pre-school children in Beijing: the Beijing study of visual impairment in children
| Autor: | Nathan Congdon, Qing Lu, Bao-chen Sun, Jian-hua Chen, Jiliang Shi, Yuan-yuan Zheng, Ailian Hu, Tong-tong Cui |
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| Rok vydání: | 2008 |
| Předmět: |
Male
Rural Population Pediatrics medicine.medical_specialty Refractive error China Visual acuity genetic structures Urban Population Visual impairment Population Prevalence Vision Disorders Visual Acuity Vision disorder Beijing medicine Humans Vision test education Child education.field_of_study business.industry Vision Tests Eye Diseases Hereditary medicine.disease Refractive Errors Health Surveys eye diseases Ophthalmology Child Preschool Female medicine.symptom business Visually Impaired Persons |
| Zdroj: | American journal of ophthalmology. 147(6) |
| ISSN: | 1879-1891 |
| Popis: | To evaluate the prevalence and causes of visual impairment among Chinese children aged 3 to 6 years in Beijing.Population-based prevalence survey.Presenting and pinhole visual acuity were tested using picture optotypes or, in children with pinhole vision6/18, a Snellen tumbling E chart. Comprehensive eye examinations and cycloplegic refraction were carried out for children with pinhole vision6/18 in the better-seeing eye.All examinations were completed on 17,699 children aged 3 to 6 years (95.3% of sample). Subjects with bilateral correctable low vision (presenting vision6/18 correctable toor= 6/18) numbered 57 (0.322%; 95% confidence interval [CI], 0.237% to 0.403%), while 14 (0.079%; 95% CI, 0.038% to 0.120%) had bilateral uncorrectable low vision (best-corrected vision of6/18 andor= 3/60), and 5 subjects (0.028%; 95% CI, 0.004% to 0.054%) were bilaterally blind (best-corrected acuity3/60). The etiology of 76 cases of visual impairment included: refractive error in 57 children (75%), hereditary factors (microphthalmos, congenital cataract, congenital motor nystagmus, albinism, and optic nerve disease) in 13 children (17.1 %), amblyopia in 3 children (3.95%), and cortical blindness in 1 child (1.3%). The cause of visual impairment could not be established in 2 (2.63%) children. The prevalence of visual impairment did not differ by gender, but correctable low vision was significantly (P.0001) more common among urban as compared with rural children.The leading causes of visual impairment among Chinese preschool-aged children are refractive error and hereditary eye diseases. A higher prevalence of refractive error is already present among urban as compared with rural children in this preschool population. |
| Databáze: | OpenAIRE |
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