Refractive Axis is a state of refractive abnormality in the human eye commonly known as astigmatism, so there is no such thing as a normal value for refractive axis. Refractive axis is generally referred to as astigmatism axis, refers to the astigmatism of the highest refractive power of the meridian position, which is an abnormal state of the human eye. This state is refractive when a person sees lines in one direction that are clear and lines in other directions that become blurred. Only astigmatism requires a refractive axis test, so there is no such thing as a normal value for the refractive axis, and the degree of astigmatism is generally expressed in terms of the range of the astigmatism axis during the test. There is no such thing as a normal value for refractive error, but rather a range of refractive error, which ranges from 0 to 360°. Different people have different refractive axis ranges, which can only be determined through professional eye examinations, and it is recommended that patients with astigmatism consult a doctor in a timely manner.