Kupl Marjean Taylor, Dobson Velma, Peskin Ellen, Quinn Graham, Schmidt Paulette
Optom Vis Sci. 2004 Apr;81(4):238-44. doi: 10.1097/00006324-200404000-00009.
To evaluate the ability of preschool children to have their threshold visual acuity assessed using a standardized, computer-based letter test.
Participants were 1195 3.5- to 5-year-old children enrolled in the Vision in Preschoolers Study. Monocular visual acuity was assessed by licensed eye care professionals (optometrists and pediatric ophthalmologists experimented in the examination of children), using the Electronic Visual Acuity tester, which uses the letters H, O, T, and V with a crowded surround.
Overall, 99.1% of children passed the training that consisted of identifying the letters H, O, T, and V by naming or matching the letters at 60 cm. Among those who passed the training, 99.6% completed the binocular pretest at 3 m, and 97.6% of those passing the training and the pretest completed monocular threshold visual acuity testing of each eye with the Electronic Visual Acuity tester. Testability increased with age for training (p = 0.03), pretesting (p = 0.04), and acuity testing (p = 0.07). Overall, 93.3% of 3.5-year-olds, 96.7% of 4-year-olds, and 98.8% of 5-year-olds completed training, pretesting, and monocular threshold acuity testing of each eye using standard letter optotypes.
Using the computer-based Electronic Visual Acuity system, nearly all 3.5- to 5-year-old children can complete monocular acuity testing of each eye.
评估学龄前儿童使用标准化的基于计算机的字母测试来测定其视敏度阈值的能力。
参与者为1195名3.5至5岁的儿童，他们参与了学龄前儿童视力研究。单眼视敏度由持照眼保健专业人员（验光师和在儿童检查方面有经验的儿科眼科医生）使用电子视敏度测试仪进行评估，该测试仪使用字母H、O、T和V，并带有拥挤的背景。
总体而言，99.1%的儿童通过了训练，训练内容为在60厘米处通过说出字母名称或匹配字母来识别字母H、O、T和V。在通过训练的儿童中，99.6%在3米处完成了双眼预测试，在通过训练和预测试的儿童中，97.6%使用电子视敏度测试仪完成了每只眼睛的单眼视敏度阈值测试。训练（p = 0.03）、预测试（p = 0.04）和视敏度测试（p = 0.07）的可测试性随年龄增长而增加。总体而言，93.3%的3.5岁儿童、96.7%的4岁儿童和98.8%的5岁儿童使用标准字母视标完成了每只眼睛的训练、预测试和单眼视敏度阈值测试。
使用基于计算机的电子视敏度系统，几乎所有3.5至5岁的儿童都可以完成每只眼睛的单眼视敏度测试。
