Farsightedness (hypermetropia) is a visual condition in which only objects located far away are clearly visible, and objects located in close distance are complicated to see. An ametropic sort of thing. At the same time, visual impairment with respect to close objects is still a key aspect for using this term, that is, if a person sees poorly in the distance, they can still be diagnosed with "farsightedness." People who suffer only from age-related farsightedness (presbyopia) can see far into the distance.
You may use glasses or contact lenses with positive values of optical power to solve the problem of identification of objects nearby. This flaw lies in the fact that the image is not centered on the retina, but behind the retina, due to the anomaly of refraction at rest. It's normally possible to concentrate the picture on the retina with the aid of accommodation voltage at a young age, with not too extreme farsightedness. Far-sighted people often feel headache when they do close-up research. Around a fifth of the population worldwide has this vision condition.
Because of the location of the primary optical concentration, hyperopia occurs not on the retina, as in normal vision but behind it. At the same time, the farsighted patient has a narrow eye (less than 22.0 mm), which would be around 24.0 mm in length with emmetropia (good vision). This prevents the perception of a consistent picture of objects at close range, and therefore decreases distance view accuracy.
Hyperopia is a congenital condition, in most cases, hyperopia decreases with age, as the growth of the eyeball in a child continues. It can provoke the appearance of strabismus and amblyopia in children.
Presbyopia, which occurs due to natural age-related changes in the accommodation function of the lens, is called presbyopia. Among patients, the name "short-arm disease" is popular, since in order to examine an object, it must be moved farther and farther from the eyes. It begins to develop most often after 40 years.
The main symptoms of hypermetropia:
- Difficulties when working near, a decrease in visual acuity in the distance;
- Rapid eye fatigue;
If at least one of the above symptoms is detected, it is necessary to undergo a vision diagnosis and consult a specialist.
There are 3 degrees of farsightedness:
- Weak degree of hyperopia;
- The refraction anomaly does not exceed +2.5 diopters;
- The average degree of hyperopia;
- The refraction anomaly is from +2.5 to +5.0 diopters;
- High degree of hyperopia;
- The refractive error in this case exceeds +5.0 diopters.
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