Hyperopia: a blurry vision up close
It may happen that farsightedness, especially if it is not high, remains unrecognized. In fact, the farsighted patient, but also the emmetropic person (without vision defects), by modifying the shape of the lens, is able to increase the dioptric power and therefore is able to obviate hyperopia. This mechanism involves a continuous use of what is called the accommodation reflex, characterized precisely by the modification of the globosity of the lens, based on the proximity or distance of the visual targets.
The rays coming from an infinite distance are parallel and focus exactly on the retina (in an emmetropic subject). In this situation, the crystalline lens is at "accommodative rest" and takes on a thinner, sharper and elongated shape. As the rays get closer to the eye, they become more and more divergent so they would not focus on the retina, but beyond it and the image would be blurred. Here, in these cases, the crystalline intervenes, increasing its surface of curvature and thus assuming a more globular shape. In this way, it increases its convergent power and allows the rays to fall equally on the retina.
With increasing age, accommodation is physiologically reduced and hyperopia becomes apparent, even for forms that were previously undiagnosed.
Hyperopia: how is it recognized?
Farsightedness determines a tiring and not perfectly clear vision of objects.
In children and young adults, as anticipated, this visual defect can be self-compensated, in the sense that it can be corrected naturally thanks to the ability to focus (accommodation mechanism). Within certain limits, the farsighted person is therefore able to see clearly and the symptoms could be imperceptible or very mild. With increasing age, however, the degree of accommodation decreases, therefore both objects placed at medium distance and distant appear blurry.
Symptoms associated with hyperopia range from reading effort, headache, to irritating eye disorders (eg burning eyes).
Symptoms of Hyperopia in the Child
In children and young people with farsightedness, visual acuity is good both far and near, but the continuous effort of accommodation gives rise to various disorders that take the name of accommodative asthenopia. It includes a sense of tiredness in the eyes, headache ( headache) after reading, blurring of vision, ocular burns, tearing and ease of developing conjunctivitis.In addition, the marked accommodative effort can cause a squint.
Symptoms Hyperopia in Adult
On the other hand, in the "adult and in the elderly" there is a reduction in acuity that appears around 40-50 years, when the accommodation is no longer able to compensate for the visual deficit and initially causes difficulties in near vision, simulating presbyopia (problematic due to the reduction of accommodation linked to advancing age), and subsequently from a distance. Here, too, headaches and alterations of the conjunctiva are frequent.with the same effect;
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