Prevalence of Visual Impairment among 4- to 6-years-old Children in Khon Kaen City Municipality, Thailand.

Objective: To evaluate the prevalence of visual impairment of children aged four to six years in Khon Kaen City Municipality, Thailand.

Material And Method: The visual acuity test was performed on 1,286 children in kindergarten schools located in Khon Kaen Municipality. The first test of visual acuity was done by trained teachers and the second test by the pediatric ophthalmologist.