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News » Astigmatism: how to behave in the presence of visual focusing deficits.
Astigmatism: how to behave in the presence of visual focusing deficits.
Astigmatism consists in a disorder of vision characterized by a lower visual sharpness due to a deformation of the surface of the eye (cornea) or to an alteration of the internal structures of the eyeball.
As a result of this disorder, images appear split, poorly defined, it is therefore necessary to correct this defect. Ultimately the astigmatic eye sees faint objects, or, in severe cases, slightly distorted, looking at objects both near and far.
Sometimes astigmatism may be associated with other disorders such as nearsightedness or farsightedness.
Alterations of the structures of the eye and focus: types of astigmatism
There are different types of astigmatism. They go under the following definitions:
a) Corneal astigmatism: is due to an abnormal curvature of the cornea;
b) Internal or lenticular astigmatism: this is due to an alterations in the internal structure of the eye, such as the crystal.
Another distinction can be drawn between:
a) Simple astigmatism: in this case the visual defect is unique, and is characterized by the presence of the focus not only on one point, but on a line.
b) Compound astigmatism: when the visual defect is associated with another disorder (myopia or farsightedness).
Symptoms associated with astigmatism
Disturbances associated with astigmatism, resulting from continuous change of focus that the eye puts in place in an attempt to obtain a clear image.
Often, these involuntary activities, cause, as an inevitable effect, pain in the eyeballs, headaches, eye fatigue, burning eyes and excessive tearing, these problems occur, especially in mild forms, generally after a prolonged effort ( reading or prolonged use of videos).
We must say, however, that having a little \'of corneal astigmatism is absolutely physiological (up to 0.75 diopters) and is not detrimental to having a good quality vision, because it gets compensated in a natural way by the eye.
Astigmatism, usually congenital, may undergo small changes in life, this irregularity may be correlated to corneal abnormalities, infection, injury, or trauma, or it may also be caused by a little known disease called keratoconus.
In all those cases, fortunately rare, in which the astigmatism strikes both eyes, which cannot be corrected properly even with the use of glasses, must be considered the opportunity of performing a relative refractory intervention.
In any case, before any surgery takes place, the ophthalmologist must be consulted to make an assessment.
How to diagnose astigmatism
Astigmatism can be diagnosed by a simple eye examination.
Early intervention is vital, so it is extremely important to have regular checks from childhood. In difficult cases the examination can take place via a corneal topography, a computerized exam that allows to obtain the map of curvature of the cornea.
Always carefully and regularly monitor this defect in order to verify any changes over time.
In the vast majority of cases the astigmatism correction is provided by the simple use of contact lenses or eyeglass lenses.
Before taking any decision, in any case, careful assessment is needed by one or more ophthalmologists, who will assess the most suitable solution for any specific case.