How to read an eyeglass prescription for astigmatism
Oct 26, 2023
Source: Cainiu Health
Dr. Wang Shuai
Introduction
In general, an eyeglass prescription can indicate astigmatism through the cylinder power and axis. Astigmatism is a vision condition in which light rays from different directions fail to focus properly on the retina, resulting in blurred or distorted vision. The cylinder power indicates the amount of astigmatism present in the eye and is typically denoted by "C".
In general, an eyeglass prescription can indicate astigmatism by the cylinder power and axis. The details are as follows:
1. Cylinder Power: Astigmatism is a vision condition in which light rays from different directions fail to focus properly on the retina, resulting in blurred or distorted vision. The cylinder value indicates the strength of astigmatism present in the eye and is typically labeled with a "C". A negative value represents myopic (nearsighted) astigmatism, while a positive value indicates hyperopic (farsighted) astigmatism. The higher the absolute value, the stronger the degree of astigmatism.
2. Axis: The axis indicates the orientation or direction of the astigmatism in the eye. It is measured in degrees ranging from 0 to 180. The axis specifies the angle at which cylindrical correction must be applied.
If astigmatism is present, it is recommended to correct it using methods such as contact lenses or prescription eyeglasses designed for astigmatism.
