Skip to main content

Table 5 Causes of visual impairment*

From: Prevalence and causes of visual impairment and rate of wearing spectacles in schools for children of migrant workers in Shanghai, China

  Right eye Left eye Children with visual impairment Prevalence in the population (%)
n (%) (one or both eyes)* (one or both eyes)*
Refractive error† 1478 1447 1795 (89.48) 18.87
Amblyopia 147 188 203 (10.12) 2.13
Ocular prosthesis 0 2 2 (0.10) 0.02
Congenital nystagmus 2 2 2 (0.10) 0.02
Congenital cataract 2 2 2 (0.10) 0.02
Macular degeneration 1 1 1 (0.05) 0.01
Opaque cornea 1 1 1 (0.05) 0.01
All 1631 1643 2006 (100.00)  
  1. Data show the frequency (%) of cases.
  2. *Children with visual acuity ≤ 20/40 in both eyes may represent two separate causes of reduced vision, one in each eye.
  3. †Refractive error was assigned as the cause of reduced vision for all eyes correcting to ≥ 20/32 with subjective refraction, even if other contributing diseases were present.