The difference between an astigmatic axial position of 170 degrees and 180 degrees is still significant.
The optical axis is a very important parameter when fitting toric lenses, representing the direction in which the long axis of the column lens points. If the axial position of astigmatism is inaccurate when fitting glasses, it will affect the patient’s visual effect and may lead to blurred, distorted and distorted vision, and cause the patient to experience dizziness, nausea and other uncomfortable symptoms.
When fitting glasses, an astigmatic axial error of 5 degrees or less is relatively small and acceptable. However, a difference of 10 degrees between 170 degrees and 180 degrees will affect the patient’s visual effect, and the gap is still relatively large. In this case, it is recommended that the glasses be re-tested.
Abnormal vision, it is recommended to go to the regular hospital ophthalmology clinic.