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Refractive errors

About refractive errors

The most common eye disorders are refractive errors, which mean that the image of the object a person is looking at is not focused properly onto the retina (the light-sensitive tissue in the back of the eye).

For perfectly clear vision, the image of a viewed object needs to be focused onto the retina, just as a camera has to be focused properly in order to take a clear picture.

If the image is not focused exactly on the retina, then the image will be blurred, just like an out-of-focus photograph. In this case, the person is said to have a refractive error.

Refractive errors occur when there is a mismatch between the length of the eye, and its optical power. These mismatches usually originate during childhood, when the eyes are growing. The exact causes of refractive errors are still being studied, but it is known that both hereditary and environmental influences can affect their development.

Who has refractive errors?

Most people have some refractive error, but in most cases the error is small, and does not cause any problems. In fact, the average person is slightly long-sighted.

Treatment

Refractive errors can usually be corrected using spectacles or contact lenses. There are also laser or other surgical techniques that can be used to correct refractive errors. These procedures are not for everyone, but may be an alternative to contact lenses or spectacles.

There are four main types of refractive errors:

• Myopia
• Hyperopia
• Astigmatism
• Presbyopia

The above information was taken from the Optometrist Association Australia.

At Heming Scott & Donald, correction of refractive errors is as precise as the best modern technology and skill allows. And our wide choice of frames will allow you to find the best possible spectacles to suit your face as well as your prescription.