School of Optometry and Vision Science, The University of Auckland, Auckland, New Zealand.
New Zealand National Eye Centre, The University of Auckland, Auckland, New Zealand.
Clin Exp Optom. 2020 May;103(3):353-360. doi: 10.1111/cxo.12958. Epub 2019 Sep 5.
Comprehensive vision screening programmes for children are an important part of public health strategy, but do not exist in many countries, including Tonga. This project set out to assess: (1) the functional vision of children attending primary schools in Tonga and (2) how a new recognition acuity test (The Auckland Optotypes displayed on a tablet computer) compares to use of a standardised eye chart in this setting.
Children from three Tongan primary schools were invited to participate. Acuity testing was conducted using a standardised recognition acuity chart (Lea symbols) and the tablet test displaying two formats of The Auckland Optotypes. Measures of ocular alignment, stereo acuity and non-cycloplegic photorefraction were also taken.
Parents of 249 children consented to participate. One child was untestable. Only 2.8 per cent of testable children achieved visual acuity worse than 0.3 logMAR in the weaker eye. Results from the Spot Photoscreener suggested that no children had myopia or hyperopia, but that some children had astigmatism. The tablet test was practical in a community setting, and showed ±0.2 logMAR limits of agreement with the Lea symbols chart.
The sample of children in Tongan primary schools had good functional vision. A modified version of the tablet acuity test is a promising option for vision screening in this context.
儿童综合视力筛查计划是公共卫生战略的重要组成部分，但在包括汤加在内的许多国家都没有实施。本项目旨在评估：（1）汤加小学儿童的功能性视力，以及（2）在这种环境下，一种新的识别视力测试（在平板电脑上显示的奥克兰视力测试图）与使用标准化视力表相比的效果。
邀请来自汤加三所小学的儿童参加。使用标准化识别视力表（Lea 符号）和显示两种奥克兰视力测试图格式的平板电脑测试进行视力测试。还测量了眼球对准度、立体视力和非睫状肌光折射。
249 名儿童的家长同意参与。有一名儿童无法测试。在可测试的儿童中，只有 2.8%的儿童在弱眼的视力低于 0.3 logMAR。Spot 照片筛查器的结果表明，没有儿童患有近视或远视，但有些儿童有散光。平板电脑测试在社区环境中实用，与 Lea 符号图表相比，其测试结果的差异在±0.2 logMAR 以内。
汤加小学儿童的样本具有良好的功能性视力。平板电脑视力测试的改良版本是这种情况下视力筛查的一个有前途的选择。
