Visual illusion mimicking dyslexia. A case history.
A 14-year-old girl with reading difficulties was found to have an unusual illusory movement of objects in the central visual field. The movement could be blocked by using a 26 mm Visolette magnifier with an arrow pasted on its lower surface to function as a reference point. After having read with help of this arrangement for 19 months the girl suddenly could see normally and has now been able to read without difficulties for over 3 years. We report the first documented case of visual illusion as the cause of reading difficulty which disappeared at the age of 15 years, thus years after the maturation of visual functions is thought to be completed. Although visual illusion like the one presented here must be rare, it should be diagnosed, because the treatment is totally different from that of usual dyslexia.
D000293:Adolescent; D003937:Diagnosis, Differential; D004410:Dyslexia / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007088:Illusions; D009903:Optical Illusions; D011932:Reading; D014786:Vision Disorders / Q000175:diagnosis* / Q000534:rehabilitation; D058609:Visual Field Tests; D014794:Visual Fields