Children may not be able to see well after a cold and fever, which may be due to conjunctivitis, fundus lesions and neurological disorders. When the baby has a cold, the nasal mucosa is congested and edematous, which can also lead to conjunctival congestion and edema caused by the nasolacrimal duct, resulting in blurring of vision, accompanied by tearing as well as itching and pain symptoms. Use tobramycin eye drops or hot towels to relieve symptoms. If the white of the eye is not red and swollen, conjunctival congestion and edema is mild, also appeared to see the situation, to rule out the existence of fundus lesions, need to take the child to the ophthalmology consultation. If the baby is accompanied by dizziness, headache and other symptoms, appear to see the situation, to consider whether there is meningitis or occupying lesions caused by optic nerve compression. It is necessary to consult a pediatrician for a cranial MRI to clarify the diagnosis.