One meridian might be perfectly focused, while another, perpendicular to it, is out of focus. For instance, an axis of 90 degrees aligns vertically, while 180 degrees aligns horizontally, ensuring the lens bends light precisely where the eye fails to do so.
Diagnosing and Treating Axis-Related Vision Problems
This small numerical value, often sitting beside a sphere and cylinder power, dictates the orientation of the corrective zone required to neutralize astigmatism. The axis number specifies the exact location of this steep and flat meridian on the 180-degree circle of the eye.
Unlike standard nearsightedness or farsightedness, which affects the eye uniformly, astigmatism is caused by an irregularly shaped cornea or lens. However, even a deviation of five or ten degrees can disrupt this balance.
Axis Related Vision Problems Diagnosis and Treatment Strategies
Axis Degree Visual Description Common Symptom if Incorrect 0 or 180 Horizontal correction Blurred side-to-side vision 90 Vertical correction Blurred up-and-down vision 45 or 135 Diagonal correction General distortion or shadowing Measurement and Adjustment Determining what does axis mean for eyes involves sophisticated diagnostic tools. During an eye exam, the practitioner uses a phoropter or an autorefractor to measure how light reacts as it enters the pupil.
More About What does axis mean for eyes
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