Furr Bruce Alan, Musch David C, Andrews Chris A, Schumann Rachel
Department of Ophthalmology and Visual Sciences, Medical School, University of Michigan, Ann Arbor, Michigan.
Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan.
Optom Vis Sci. 2018 Jul;95(7):588-593. doi: 10.1097/OPX.0000000000001240.
Vision screening can identify people who have vision problems requiring a comprehensive examination. When children are screened, the most prevalent serious problem is amblyopia secondary to uncorrected ametropia. Screening also identifies strabismus, which can lead to loss of binocularity. Early diagnosis permits treatment with restoration of balanced vision and binocularity.
The study evaluated the testability of the Titmus V3 Vision Screener as a method to screen vision and strabismus in pre-school children.
Pre-school children between 36 and 66 months of age underwent vision screening in six Michigan counties. The State of Michigan screening consists of the LEA Symbols test for visual acuity and the stereo butterfly for near-strabismus testing. The proposed Titmus V3 screening tests were the LEA Symbols slide for vision and near-strabismus test slide. Primary and secondary objectives of this study were to evaluate the percentage of pre-school children who completed the Titmus V3 screening tests for vision and near strabismus and factors associated with an inability to complete the tests, contrasting the pass/fail results between the state and Titmus V3 results.
Two-hundred sixty-three children were tested. The percentages of children unable to score on the Titmus V3 instrument versus the state's LEA Symbols test were 16.0% and 5.3%, respectively. The percentage of children unable to score on the Titmus V3 near-strabismus test slide was 6.9 versus 3.4% on the State of Michigan stereo butterfly test. Younger age at testing was the most important factor associated with the inability to complete testing.
Because of testability limitations and higher failure rates relative to the State of Michigan testing methods, the Titmus V3 screening device is not a feasible alternative to the standard methods used by the State of Michigan for vision and near-strabismus screening among the pre-school subjects we tested.
视力筛查可识别出有视力问题需要全面检查的人群。对儿童进行筛查时，最常见的严重问题是未矫正屈光不正继发的弱视。筛查还能发现斜视，斜视会导致双眼视功能丧失。早期诊断有助于进行治疗，恢复视力平衡和双眼视功能。
本研究评估了Titmus V3视力筛查仪作为筛查学龄前儿童视力和斜视方法的可测试性。
在密歇根州的六个县，对36至66个月大的学龄前儿童进行视力筛查。密歇根州的筛查包括用于视力测试的LEA符号测试和用于近斜视测试的立体蝴蝶图。拟用的Titmus V3筛查测试包括用于视力测试的LEA符号幻灯片和近斜视测试幻灯片。本研究的主要和次要目标是评估完成Titmus V3视力和近斜视筛查测试的学龄前儿童的百分比，以及与无法完成测试相关的因素，并对比该州测试结果与Titmus V3测试结果的通过/未通过情况。
共测试了263名儿童。无法在Titmus V3仪器上得分的儿童百分比与该州LEA符号测试的相应百分比分别为16.0%和5.3%。无法在Titmus V3近斜视测试幻灯片上得分的儿童百分比为6.9%，而在密歇根州立体蝴蝶图测试中的相应百分比为3.4%。测试时年龄较小是与无法完成测试相关的最重要因素。
由于存在可测试性限制且相对于密歇根州的测试方法失败率更高，对于我们测试的学龄前儿童，Titmus V3筛查设备并非密歇根州用于视力和近斜视筛查的标准方法的可行替代方案。
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