Long & Short Sightedness and Astigmatism

Laser eye surgery is used to correct visual problems, most commonly:

  • Myopia (short sightedness).
  • Hyperopia – better known as long sightedness
  • Astigmatism

Here we’re going to tell you a little more about each of these conditions and how laser eye surgery can help to correct them.

Diagram-myopia

Myopia is a condition which causes blurry vision at distance. This is caused by the way the light is focused in the eye. In a normal eye, light is focused directly onto the retina, but in a myopic eye, the light is focused in front of the retina.  The cause of this is either the eye is too long or the cornea is too steeply curved. Short-sightedness means close work, such as reading and watching television, isn’t a problem. However, for driving or at the cinema this becomes an issue without the aid of glasses or contact lenses to clarify the vision.

Laser eye surgery can correct short-sightedness by reshaping the cornea. The laser shapes the cornea to be slightly flatter which allows light to focus directly onto the retina, rather than in front of it.

diagram-hyperopia

Hyperopia is the exact opposite condition to myopia. It causes blurry vision close up, but distance vision is good and clear. As is the same with short-sightedness, this is caused by the way the light is focused because the eye is too short or the lens too flat, which results in the light being focused just behind, rather than directly onto, the retina, causing blurred vision. Sufferers of long-sightedness require glasses for reading, or computer work.

Surgery can correct long-sightedness by reshaping the cornea into a more curved shape, which allows light to focus forwards, rather than behind it.

Human eye

Astigmatism causes blurred vision and can often occur alongside long or short-sightedness. An abnormality in the curvature of the cornea causes this condition. In a normal eye, the cornea is usually round like a ball, but someone with astigmatism has corneas in more of an oval, or rugby ball, shape. Rays of light do not reach a single point and as a result cannot be focused correctly, causing blurred vision.

Like with myopia and hyperopia, this can be corrected with surgery. The laser is used to smooth the cornea into a regular and more rounded shape, to allow the light to focus into a single point.

Advanced Vision Care are experts in laser eye surgery and will be happy to discuss your condition and the best options for treatment and correction. Please contact us for more information and to book your consultation.

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