Dyslexia refers to the phenomenon that children with normal intelligence and no obvious physical impairment, but their reading performance is significantly lower than that of children of the same age by more than two grades.
According to the above definition, which one of the followings is dyslexia?
Xiaohua once had a fever, and she had sequelae of vision after being healed. She is nine years old now, but she is still illiterate, let alone reading.