A 5 year old with 400 diopters of astigmatism does not usually go blind when he grows up.
A 5-year-old child with 400 degrees of astigmatism has high astigmatism, which will affect the patient’s vision and may result in complications such as amblyopia, but generally does not cause blindness when the child grows up.
At present, you should take your child to the ophthalmology department of the hospital for a corneal topography examination to rule out high astigmatism caused by diseases such as cone cornea. If it is diagnosed to be caused by cone cornea, corneal cross-linking surgery is usually needed for treatment.
For simple astigmatism, it needs to be corrected by wearing glasses, and if amblyopia is already present, further amblyopia training is needed.
Parents of a 5-year-old child with 400 degrees of astigmatism should attach great importance to it and go to the hospital for examination as soon as possible, so that the doctor can evaluate and guide the patient for treatment.