Singman Eric L, Matta Noelle S, Tian Jing, Silbert David I
From the Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland;
From the Family Eye Group, Lancaster, Pennsylvania and.
Am Orthopt J. 2015;65:94-8. doi: 10.3368/aoj.65.1.94.
There is little data validating most illiterate eye charts. Lea Symbols®, however, have been well validated in numerous studies. In this study, we compare the assessment of visual acuity employing both the Lea Symbol hanging wall Early Treatment Diabetic Retinopathy Study (ETDRS)-style chart and a similar Patti Pics® ETDRS-style chart in order to determine whether the two charts provide clinically similar data.
We tested the vision of the right eyes of fifty-two consecutive patients. Patients were cooperative children or adults between the ages of 3 and 88 years (mean 58 years). We alternated the order of the chart used first. Patients were also categorized by age and by visual acuity.
The visual acuities measured by the two charts were equal for 83% of the measurements (forty-three eyes). In 8% of eyes (four eyes), the visual acuity measured with the Lea Symbols was one line better than that measured by the Patti Pics; in 9% of eyes (five eyes), the acuity from the Patti Pics chart measured one line better than the Lea Symbols. There was no difference in measurements for either adults or children or among patients with different visual acuities.
We believe this study will serve to provide useful information when choosing an eye chart to assess visual acuity in a clinic setting. Patti Pics performed similarly to Lea Symbols in adults and children tested in a multi-specialty ophthalmology practice. We suspect that it would also perform similarly in the primary care and school settings.
大多数文盲视力表的有效性数据很少。然而，Lea Symbols® 在众多研究中已得到充分验证。在本研究中，我们比较了使用Lea Symbol悬挂式早期治疗糖尿病性视网膜病变研究（ETDRS）风格视力表和类似的Patti Pics® ETDRS风格视力表评估视力的情况，以确定这两种视力表是否能提供临床上相似的数据。
我们对连续52例患者的右眼视力进行了测试。患者为3至88岁（平均58岁）的合作儿童或成人。我们交替使用首先测试的视力表顺序。患者还按年龄和视力进行了分类。
在83%的测量中（43只眼），两种视力表测得的视力相等。在8%的眼睛（4只眼）中，使用Lea Symbols测得的视力比Patti Pics测得的视力好一行；在9%的眼睛（5只眼）中，Patti Pics视力表测得的视力比Lea Symbols好一行。成人、儿童或不同视力患者之间的测量结果没有差异。
我们相信这项研究将为在临床环境中选择视力表评估视力时提供有用信息。在多专科眼科诊所测试的成人和儿童中，Patti Pics的表现与Lea Symbols相似。我们怀疑它在初级保健和学校环境中也会有类似表现。
