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As we have seen, the role of different transparent media of the eye is to make the image that we see, formed on the retina, the same way as in a camera, the function is to photograph the image that is formed in the film. If so before or after the picture will be blurred.

An eye hipermetrope is one that, as the rest, of the images from the infinity (from about 5 meters - as in the cameras -) behind the retina. So the image that comes to it is blurred, thereby transmitted to the brain.

What happens when you look at a close object? Because diverging rays entering the eye, meaning that the image is formed further away from the retina, and therefore will be more blurred vision.

CORRECTION: Light rays coming from infinity (again, from about 5 meters) fall parallel to the eye, and converge (form the image) after retina. It seems logical that if the rays entrasen converging, the image is formed closer to the retina, or even in the same retina. Or it would be less blurry, or even entirely clear. And how do you get this done? Then placing a converging lens to the eye.

CAUSES And, why the image can be formed before the retina, and not in place?

There are many causes. The most common include: a lack of eye length, or lack of power of the transparent media of the same (due for example to a change in curvature of the cornea, or a change in the refractive index of any of they - because of a metabolic disorder, for example)

SYMPTOMS So we can say since a hyperopic eye looks bad from far and near?

Well no, not yet, and it's not that easy. We saw that the visual system is dynamic, and that there is "accommodation" that allows zoom in varying the thickness (and therefore power) of the lens. As we have seen, with the eye at rest, the farsighted way the image of a point at infinity in the retina. If the lens to increase its power (which can be done by accommodation), the image is formed closer to the retina, or even herself.

We can therefore conclude that a hyperopic eye can see neatly away at the cost, that if an additional accommodative effort. If you have a lot of accommodation (as in the case of a child for example) and the amount of hyperopia is not large, this effort will not be detected. If the amount of hyperopia is large and accommodation is also available to us a lot, we would see well, but astenópicas discomfort appear, ie eyestrain, headaches, eye irritation, etc. And if we do not have as much accommodation (This decreases with age, as studied elsewhere on this site), we would simply not.

But that's not all. We know that for near must launch the "accommodation", and therefore make an effort. If you also farsighted, the effort will be even greater: to zoom in and compensate for hyperopia. It is for this reason that the inconvenience of a near sighted appear before it by far.

In short, one farsighted may see well from far and near, see well from far and near upset, do with discomfort from far and near evil, or even not see well nowhere near even close. Everything will depend on the accommodation of its possession (of age at last after all) and the amount of farsightedness you have.

EVOLUTION In general, a normal healthy eye has a slight farsightedness, hyperopia called physiological, neither bothers nor accurate correction.

As is logical, there is usually in childhood hyperopia (the eye is small and growing), to be reduced over time to grow the eye, until it stabilizes at about seven or eight years.

The treatment and correction of hyperopia is relatively complex, and depend on many factors, such as visual acuity, presence of asthenopia symptoms, type of occupation, age, the presence of strabismus, or even the appearance of symptoms vague, such as headaches, apathy at work, to undertake it early fatigue, itching, etc.

And for sure as in any other case, a frequent vision test done by an eye doctor becomes a need in your health, even starting when you are young.