What is Astigmatism?
Medically Reviewed by Dr. Samantha Rao, OD, FAAO, FSLS on February 6, 2025
Astigmatism is a common eye condition that occurs when the cornea, the clear front surface of the eye, is irregularly shaped. Instead of being perfectly round like a basketball, an astigmatic cornea is more oval-shaped, similar to a football. This irregular shape prevents light from focusing properly on the retina, resulting in blurred or distorted vision.
Symptoms of Astigmatism
People with astigmatism often experience:
- Blurry or distorted vision at any distance
- Halos or starbursts around lights
- Eye strain and fatigue
- Headaches
- Difficulty seeing at night
Causes of Astigmatism
While the exact cause of astigmatism is often unknown, it’s believed to be primarily genetic. It can also develop as a result of:
- Eye injury
- Eye surgery
- Certain eye conditions
Treatment for Astigmatism
Fortunately, astigmatism is easily correctable with:
- Glasses: Prescription glasses with cylindrical lenses can correct the irregular curvature of the eye.
- Contact Lenses: Both soft and rigid contact lenses can correct astigmatism. Patients with very high astigmatism or irregular astigmatism may see better with a rigid gas permeable (RGP) or scleral contact lens.
If you suspect you may have astigmatism, it’s important to schedule a comprehensive eye exam with an optometrist. Early diagnosis and treatment can significantly improve your vision and quality of life.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Please consult with an optometrist for diagnosis and treatment of any eye condition.
