Can myopia cause astigmatism?
Jun 29, 2022
Source: Cainiu Health
Dr. Chen You
Introduction
Myopia does not necessarily coexist with astigmatism. However, most individuals with myopia have some degree of astigmatism, though the severity varies. Myopia and astigmatism commonly occur together in the eye. Myopia primarily refers to a refractive condition in which parallel light rays, after passing through the eye, converge to a focal point. Astigmatism, by contrast, refers to a condition in which parallel light rays focus along a line (focal line) rather than at a single point. Both conditions are frequently present simultaneously in most people’s eyes.
As academic and occupational pressures increase, many individuals develop eye problems—most commonly myopia. Some patients suffer from high myopia, which may be accompanied by astigmatism, further worsening visual blurriness. If myopia and astigmatism remain uncorrected, refractive errors may progressively worsen. So, does myopia cause astigmatism?
Can myopia cause astigmatism?
Myopia does not necessarily cause astigmatism. However, most individuals with myopia do have some degree of astigmatism—though the severity varies. Myopia and astigmatism frequently coexist in the same eye. Myopia primarily refers to a refractive condition where parallel light rays entering the eye converge to a focal point *in front of* the retina. Astigmatism, by contrast, occurs when parallel light rays focus along a line (rather than at a single point) due to uneven corneal or lens curvature. Both conditions commonly occur together in most people. Corneal astigmatism arises mainly from structural irregularities—specifically, an oval-shaped (rather than perfectly spherical) cornea with varying curvatures across different meridians. This elliptical shape results in differing refractive power along distinct axes, thereby producing astigmatism.
To prevent myopia progression, it is essential to maintain overall ocular health and avoid overstraining the eyes. Rest your eyes regularly—especially when feeling fatigued. When eye strain occurs, simply close your eyes for a brief rest. Additionally, avoid staying up late; instead, adopt a consistent sleep schedule with early bedtimes and early risings to ensure adequate rest and recovery for your eyes.
In daily life, cultivate healthy lifestyle and dietary habits. We hope this information proves helpful to you.
