Safra D
Klin Monbl Augenheilkd. 1995 May;206(5):365-6. doi: 10.1055/s-2008-1035463.
Based on their experiences several authors consider an alternating central scotoma as the main reason for reading difficulties due to dyslexia.
Searching for a simple and reliable method for determination of an alternating central scotoma we used a pair of synoptophore fusion images, in the center of which we added the letter F respectively L as central control signs. A spontaneously perceived and persisting E means a perfect and stable orthophoria. A persisting F or L with fusion of the images means a one sided central scotoma. Alternation of F and L with fusion of the images means an alternating central scotoma.
By examining normal readers, untreated asthenopic and untreated dyslexic patients, we found mostly rapid alternation of F and L in the latter two groups, whereas most of the normal readers saw F, L and E alternating at longer intervals.
Thus undisturbed reading seems not to demand perfect orthophoria. On the other hand a rapidly alternating central scotoma may be considered as an important factor causing reading difficulties.
基于他们的经验，几位作者认为交替性中心暗点是诵读困难导致阅读困难的主要原因。
为寻找一种简单可靠的方法来确定交替性中心暗点，我们使用了一对同视机融合图像，在其中心分别添加字母F和L作为中心对照标志。自发感知并持续出现的E表示完美且稳定的正位视。图像融合时持续出现F或L表示单侧中心暗点。图像融合时F和L交替出现表示交替性中心暗点。
通过检查正常读者、未经治疗的视力疲劳患者和未经治疗的诵读困难患者，我们发现后两组中F和L大多快速交替，而大多数正常读者看到F、L和E交替的间隔时间更长。
因此，不受干扰的阅读似乎并不需要完美的正位视。另一方面，快速交替的中心暗点可能被视为导致阅读困难的一个重要因素。
