Short sightedness (myopia)
Short sight occurs when light is focused in front of the retina and causes distance vision to become blurred. This is usually caused by the axial length of the eye being too long for the focal power of the eye. Near vision, however, is usually clear. This commonly develops in childhood or adolescence and is often first noticed by blurring of writing on the school blackboard. It is correctable with spectacles, contact lenses or laser treatment.
Long sightedness (hypermetropia)
Long sight occurs when the natural tendency is to focus light beyond the retina rather than on it, and the eye has to make a compensating effort to re-focus. With a younger person this may only be possible with effort and may, for example, cause headaches when reading. In an older person, as well as making reading very difficult, it may also cause distance vision to become blurred. It is corrected with spectacles, contact lenses or laser treatment.
Astigmatism occurs when the front of the eye is rugby ball shaped instead of being regularly curved (spherical) like a ball. In this case both distance and near vision may be distorted. It is corrected with spectacles or contact lenses.
As we get older, the lens of the eye thickens and slowly loses its flexibility leading to a gradual decline in our ability to focus on objects that are close up. This loss of focusing ability is called PRESBYOPIA. It is corrected with spectacles or contact lenses.
If you have any concerns or queries, please telephone 0191 3770628 to make an appointment at Grundy and Naisbitt, Coxhoe, Durham.