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Mingxing Wu, Yingyan Qin, Liangping Liu, Shaobi Ye, Min Fu, Zhenzhen Liu, Young Tsau; A New Computerized Autoacuity Test for Assessment of the Visual Acuity of Pre-school Children. Invest. Ophthalmol. Vis. Sci. 2013;54(15):5723. doi: https://doi.org/.
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This study aims to propose and verify a novel protocol called Autoacuity Test for fast vision screening among pre-school children.
991 children (3 to 6 years) from 7 kindergartens were tested with both the ETDRS Chart and Autoacuity Test. Of these children, 234 were randomly selected to re-examine. All subjects were examined to exclude other ophthalmic problems. The Autoacuity Test was conducted using a computer generated randomly located checkerboard testing objects of variable spatial frequencies against an identically illuminated background shown on a display, where visual acuity was defined as logarithm of the minimal view angle of the square size that the subject could detect the object.
The mean ages of the subjects is 4.6 ± 1.8 years, the testability for the Autoacuity Test and ETDRS chart is 93.6% and 98.5%, respectively. The mean visual acuities were 0.27 ±0.22 for the Autoacuity Test and 0.23 ± 0.22 for the ETDRS test, respectively. The limit of agreement between the Autoacuity Test and the ETDRS Chart was (-0.30, 0.22). And about 90% of visual acuity biases between two methods were within 0.20 log units. Bland-Altman plots suggested that 95% of visual acuities measured by the test and retest would differ within 0.25 log units(for Autoacuity Test). The intraclass correlation coefficient and its 95% CI for the test-retest was 0.495(0.392, 0.586) for the Autoacuity.
The Autoacuity Test has fair test-retest repeatability and good concordance with ETDRS chart. The Autoacuity test is a good candidate method for fast vision screening among children.
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