Prevalence and pattern of refractive error and visual impairment among schoolchildren: the Lhasa childhood eye study

Table 4 Causes of Uncorrected Visual Acuity (UCVA) of 0.3 or Worse

Cause	Eyes with UCVA 0.3 or Worse		Percent Prevalence in the Population
Cause	n	%	Percent Prevalence in the Population
Refractive error	285	70.5	15.4
Amblyopia	33	8.2	1.8
Corneal opacity	2	0.5	0.1
Cataract/posterior capsular opacification	1	0.2	0.1
Other	3	0.7	0.2
Unexplained cause	54	13.4	2.9

ISSN: 1471-2415