Children with 300 degrees of astigmatism will not heal on their own. Astigmatism in children is usually congenital, meaning it is due to genetic factors. There are also a few cases where astigmatism is secondary, caused by poor eye habits or eye injuries, among other reasons. However, regardless of the cause, once astigmatism occurs, there is basically no possibility of it resolving on its own. Astigmatism is a type of refractive error that needs to be corrected by wearing glasses. Moreover, 300 degrees of astigmatism is considered high and can lead to eye fatigue over time. If not corrected, it can also have a serious impact on a child's vision, so parents must pay adequate attention.