摘要To the Editor:A 4-month-old girl was brought to the Department of Ophthalmology in the Children's Hospital,School of Medicine,Zhejiang University,due to "sudden eyeball shaking for a week." The patient was a full-term gravida 2 para 2 infant without any incidence of trauma/surgery;further,the family's medical history did not reveal any risk factors.Ophthalmological examination revealed bilateral horizontal tremor of the eyes,and both eyes showed light-chasing response.The anterior segment examination was normal.After mydriasis,the wide-angle retinal imaging system examination revealed that the binocular optic discs were clear with normal color and flat retina;no obvious abnormal exudation or position occupying was seen,but the left eye showed obvious retinal vasodilation with slight distortion [Figure 1A and 1B].