Pott J W, Oosterveen D K, Van Hof-van Duin J
Department of Physiology, Erasmus University Rotterdam, The Netherlands.
J Pediatr Ophthalmol Strabismus. 1998 Jul-Aug;35(4):216-22. doi: 10.3928/0191-3913-19980701-08.
Assessment of monocular visual impairment during screening of young children is often hampered by lack of cooperation. Because strabismus, amblyopia, or anisometropia may lead to monocular suppression during binocular viewing conditions, a test was developed to screen for suppression in young children.
Children were invited to look through two polaroid filters of different polarization direction at two pictures covered with polaroid filters of opposite polarization direction. In this way, each eye could only see one of the two pictures. In cases of suppression, only one picture would be visible. Acuity measurements in 201 5-year-old children were compared with the Polaroid Suppresion test (PST) results.
The PST had a high success rate (99.5%) and testing time was under 1 minute. Specificity of the PST for acuity impairments was 91%. The low sensitivity of 60% was caused mainly by the fact that some children with binocular acuity impairments were not detected with the PST. However, the PST was highly sensitive for significant interocular acuity differences.
The PST has been found to be a useful screening method for amblyogenic factors in young children. The test can be carried out without occlusion of one eye. The apparatus is portable, the test duration is short, and the costs are low. The results indicate that the PST is a very promising tool to use in clinical conditions and for screening large numbers of young children.
在幼儿筛查过程中，单眼视力损害的评估常常因缺乏配合而受阻。由于斜视、弱视或屈光参差可能导致双眼注视时单眼抑制，因此开发了一种用于筛查幼儿抑制情况的测试。
邀请儿童透过两个偏振方向不同的宝丽来滤光片观看两张覆盖有偏振方向相反的宝丽来滤光片的图片。通过这种方式，每只眼睛只能看到两张图片中的一张。将201名5岁儿童的视力测量结果与宝丽来抑制测试（PST）结果进行比较。
PST成功率高（99.5%），测试时间不到1分钟。PST对视力损害的特异性为91%。60%的低敏感性主要是因为一些双眼视力损害的儿童未被PST检测到。然而，PST对显著的双眼视力差异高度敏感。
已发现PST是一种用于筛查幼儿致弱视因素的有用筛查方法。该测试无需遮盖一只眼睛即可进行。该设备便于携带，测试持续时间短，成本低。结果表明，PST是一种在临床环境中以及用于筛查大量幼儿时非常有前景的工具。
