Does the axis of eyeglass lenses make a big difference?

If astigmatism is present, the axis position of eyeglass lenses significantly affects vision; if the degree of astigmatism is low, the impact of the axis position on vision is relatively smaller. If discomfort or blurred vision occurs while wearing the glasses, medical advice should be sought promptly to adjust the lens axis. The analysis is as follows:

The axis position is a key parameter for astigmatic lenses. It refers to the angle between the lens's orientation and the horizontal plane. The axis determines the geometric structure of the lens and its relative position in front of the wearer’s eye, thus significantly influencing visual correction effectiveness and wearing comfort. An inaccurate axis causes misalignment between the optical center of the lens and the pupil center of the eye, preventing proper focusing of light and resulting in blurred vision. This may lead to symptoms such as double vision and dizziness, severely affecting daily life and work.

The axis mainly influences vision when the degree of astigmatism is relatively high. If astigmatism is mild and the spherical-to-cylindrical ratio is large, the effect of the axis on vision is relatively small. To ensure accurate axis measurement, a professional eye examination is required. Optometrists use specialized equipment and techniques to measure the axis and then fabricate the glasses accordingly.

Regular eye examinations are recommended, along with professional guidance from an optometrist during refraction testing, to ensure accuracy of the axis. When wearing glasses, it is important to ensure that the lens axis aligns precisely with the center of the eye's pupil to maximize visual correction effectiveness.