How does child astigmatism form?

Astigmatism is a refractive error, mainly caused by irregular corneal morphology. There are generally two causes of astigmatism in children. One is congenital corneal astigmatism, which exists at an early age and can be corrected by wearing glasses or corneal contact lenses. Secondly, there may be some eye diseases that cause astigmatism, such as keratitis, corneal scars, corneal trauma, etc.