The optic nerve development of a six-year-old child is basically perfect, and the normal range of visual acuity should be around 0.8-1.0. A visual acuity of 0.6 is considered abnormal and should be examined in detail at an eye clinic as soon as possible to rule out amblyopia or other eye developmental abnormalities. If a six-year-old child has amblyopia, he or she can undergo prescription glasses and amblyopia training under the guidance of a doctor to improve the phenomenon. He or she also needs to ensure good eye habits in daily life, and avoid looking at cell phones and TV for too long, which will lead to a further decline in visual acuity.