Is severe astigmatism in one eye serious?

Nowadays, people often neglect proper eye care in daily life, which can negatively affect eye health, impair vision, and even lead to astigmatism. So, is astigmatism in one eye considered severe?

Is astigmatism in one eye considered severe?

Astigmatism of less than 100 diopters (D) in a single eye is generally classified as mild and commonly encountered, with no significant clinical severity. Whether corrective glasses are needed largely depends on whether the astigmatism affects visual acuity. Astigmatism is a common clinical condition, primarily caused by asymmetry in the corneal meridians, resulting in light focusing at multiple points rather than a single point—hence the term “astigmatism.” When astigmatism occurs posteriorly within the eye, it typically presents no obvious clinical symptoms; the eye can compensate through natural accommodation, and thus may remain asymptomatic. In the absence of eye strain or discomfort, no specific treatment is required—only periodic observation is advised. However, if astigmatism progressively worsens—exceeding 100 D—or causes blurred vision, intervention becomes necessary.

To address astigmatism in one eye, begin with a comprehensive ophthalmologic refraction examination at an optometry clinic, including uncorrected visual acuity testing, to determine whether visual acuity meets age-appropriate standards. If standards are not met, further evaluation is warranted—including distance visual acuity testing using a 5-meter chart and near visual acuity testing using a 33-cm chart—followed by cycloplegic refraction. Cycloplegia fully relaxes the ciliary muscle, enabling precise measurement of astigmatism. If indicated, corrective treatment with spectacles or rigid gas-permeable contact lenses may be prescribed for adaptive correction, helping to stabilize astigmatism progression and improve corrected visual acuity, thereby ensuring optimal visual quality.

If visual acuity declines and astigmatism exceeds 100 D, prompt medical intervention is generally recommended. We hope this information proves helpful to you.