The difference between spectacles with an axial position of 175 and 180 degrees lies in the fact that the cylindrical component of the spectacle lens, which is the component that corrects astigmatism, has a different axial orientation.
Spectacles for patients with myopia or hyperopia alone do not have an axial position, but if there is a combination of astigmatism, there is a corresponding axial parameter. And this parameter corresponds to the axial direction of the column lens, usually a number between 0 and 180 degrees.
Spectacle axial position of 175 and 180, both of which are conformal astigmatism, indicate a difference of 5 degrees in the axial direction of astigmatism. If the patient’s astigmatism is high and the axial difference of the prescription lenses is 5 degrees, it may significantly affect the visual quality, and then need to be re-tested.
It is recommended to go to a regular hospital to avoid discomfort.