What is it?
Astigmatism is a common condition where the cornea (the clear front surface of the eye) or the lens inside the eye has an irregular shape. Instead of being round like a football, it’s shaped more like a rugby ball. This irregular curve causes light to focus at multiple points, making vision at all distances blurry or distorted.
Symptoms
- Blurred or distorted vision at all distances
- Difficulty seeing clearly at night
- Eye strain and headaches
- Squinting to see better
Causes
Astigmatism is usually present from birth and may occur alongside myopia or hyperopia. It is not caused by reading in poor light or sitting too close to the TV, despite common myths.
Treatment
- Glasses – with special cylindrical lenses to correct uneven focusing.
- Contact lenses – including toric lenses designed for astigmatism.
- Refractive surgery – options like LASIK can reshape the cornea for suitable candidates.
When to see an optometrist
If your vision seems distorted, or straight lines appear bent or blurry, book an eye test. Astigmatism is very common and easily managed.
Resources
- South African Optometric Association
- American Academy of Ophthalmology – Astigmatism
- NHS – Long – Astigmatism
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