Harris M J, Robins D, Dieter J M, Fine S L, Guyton D L
Ophthalmology. 1985 Nov;92(11):1550-3. doi: 10.1016/s0161-6420(85)33836-8.
A series of cards each containing a two dimensional array of identical Snellen "E's" was used to determine best eccentric visual acuity in patients with macular disease having Snellen visual acuity of 20/70 or worse. Each "full field E" card simultaneously presents the same letter to foveal and parafoveal areas. This test can therefore determine quickly if potentially useful vision is present in any area of the central visual field. In our study of 37 eyes, 70% demonstrated potential visual acuity at least two times better than visual acuity measured by conventional methods, and 20% demonstrated at least a fourfold improvement. This suggests that most patients with macular disease do not spontaneously employ their best remaining area of retina for fixation.
使用一系列卡片，每张卡片都包含一个由相同的斯内伦“E”组成的二维阵列，以确定视力为20/70或更差的黄斑疾病患者的最佳偏心视力。每张“全视野E”卡片同时向中央凹和旁中央凹区域呈现相同的字母。因此，该测试可以快速确定中央视野的任何区域是否存在潜在有用的视力。在我们对37只眼睛的研究中，70%的眼睛显示出的潜在视力比传统方法测量的视力至少好两倍，20%的眼睛显示出至少四倍的改善。这表明大多数黄斑疾病患者不会自发地使用其视网膜剩余的最佳区域进行注视。
