LaserVision

What is Astigmatism?

Astigmatism is a common condition in which the eye does not focus light evenly over the retina to result in distorted or blurred vision at all distances.

The opticians’ prescription will show two numbers, called ‘Sphere’ and ‘Cylinder’. The larger the cylinder is, the more astigmatism there is and the greater the blur. 

Astigmatism Symptoms

What are the Symptoms?

  • Distorted/blurred vision at all distances
  • Headaches
  • Eye strain (asthenopia)
  • Fatigue
  • Night-driving difficulties

What are the Causes?

Astigmatism is caused by irregularities in the curvature of the parts of the eye responsible for focusing light rays (the cornea and the lens). An even curve (a round eye) results in even distribution of the light rays making up an image, which will be clear.

If the curvature of the eye is uneven (rugby ball shaped), light rays will be unevenly distributed, causing blurred images at distance and at near. Clinical research highlights a strong genetic basis for astigmatism. Other associations include: previous scarring, trauma, surgery and conditions such as Pterygium and Keratoconus.

Causes
Causes

What are the Causes?

Astigmatism is caused by irregularities in the curvature of the parts of the eye responsible for focusing light rays (the cornea and the lens). An even curve (a round eye) results in even distribution of the light rays making up an image, which will be clear.

If the curvature of the eye is uneven (rugby ball shaped), light rays will be unevenly distributed, causing blurred images at distance and at near. Clinical research highlights a strong genetic basis for astigmatism. Other associations include: previous scarring, trauma, surgery and conditions such as Pterygium and Keratoconus.

Astigmatism Diagnosis

What is the Diagnosis?

Spectacles and contact lenses can be prescribed by your high-street Optometrist. For a permanent solution to astigmatism, refractive surgery can be a safe and viable alternative.

There are a number of methods available and one or more may be appropriate for you. The most familiar of these methods will be modern LASIK surgery in which the shape of the cornea (clear window on the front of the eye) is reshaped.

Other methods include the Implantable Contact Lens (ICL) and Refractive Lens Exchange (RLE). If astigmatism is caused by a pathology such as Keratoconus, therapeutic treatment (such as cross-linking) will stabilise the condition and may be more appropriate.

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Need to know more about this condition?

If you’d like some more information or to discuss this condition with one of our experts, simply drop us a line or give us a call and we’d be delighted to speak with you.
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