Astigmatism and Amblyopia among Native American Children (AANAC): design and methods.

摘要: The overall goal of the AANAC study is to improve detection astigmatism and prevention amblyopia in populations with a high prevalence astigmatism. To meet this goal, will evaluate four methods screening for preschool children assess both short-term long-term benefits early correction improving acuity preventing amblyopia. This paper presents an overview design methodology study. Subjects are members Tohono O'Odham Nation, Native American tribe Preschool-age who attend Head Start screened tools: Marco Nidek KM-500 autokeratometer, MTI photoscreener, Nikon Retinomax K-Plus autorefractor, Lea Symbols chart. Sensitivity specificity significant astigmatism, as measured by technique that uses cycloplegic retinoscopy autorefraction, determined each tools. Presence evaluated measurement best-corrected recognition orthogonal gratings. Spectacles provided all 3-year-old > or =2.00 diopters (D) 4- 5-year-old =1.50 D Persistence after glasses wearing follow-up gratings, conducted 2-5 months prescribed. Long-term effectiveness prescription through two groups first-grade children: one group participated program before intensive vision was initiated, second study's program.