Farsightedness develops after age 40 years. At the same time, closer to the eyes is the object, the harder to see. But not all the people in 40, 50 or even 60 years are far-sighted. Of great importance in the development of age-related farsightedness are heredity and lifestyle.
What is the age farsightedness and why it develops
The human eye is arranged so that it can be considered objects arranged as far and close. Much of this depends on the elasticity of the lens and the contractility of the ciliary muscle of the eye that changes the curvature of the lens, making it a little more round, then more flat. The lens is a lens in which the refracted rays. When the ciliary muscle contracts, the tension of its fibers attached to the lens is reduced, the lens becomes circular, its radius of curvature is reduced. The result is a clear view of objects on the retina, located at a short distance, allowing them to consider well.
With age, a person is reduced elasticity of the lens and the contractile ability of the ciliary muscles, the lens can not acquire a round shape, which means that a person can not see objects located at a short distance. This state has been called presbyopia
Hyperopia - than it is fraught?
or presbyopia. With presbyopia, the rays entering the eye crossed not so, as expected, on the inside of the eye - the retina, but behind it, so the subject is considered vague outlines.
How does presbyopia
The first symptoms of presbyopia appear after 40 years. The man notices that it becomes difficult to read a book with fine print, especially in low light. It is the natural aging process of the body, but it takes different people at different ages, due to the genetic characteristics of an organism and the degree of "exploitation" of the organ of vision.
With age, the eyes get tired quickly when working in close proximity to the eyes, especially at night, in poor light. There is a need to distance itself from the text at arm's length to read it. Therefore, the disease is called presbyopia long arms. If a person's work is connected with constant examining of objects at close range, some of the stress may appear severe headaches and blurred vision even more - all nearby objects will be seen vague. In accordance with the individual characteristics of the human degree of presbyopia will be more or less rapidly, and gradually increase the reading will be possible only with glasses.
Presbyopia develops over time in people who have normal vision and, and myopia and hyperopia.
So, if in his youth the man had hidden farsightedness, which was compensated by a good contractile ability of the ciliary muscle (accommodation), the age farsightedness becomes apparent due to the decrease of the ciliary muscle function.
When hyperopia increases the risk of glaucoma
Glaucoma - a perspective possible blindness
- Increased intraocular pressure.
The degree of presbyopia may be weak (2, 0 diopters - D), medium (up to 5 D 0) and high (greater than 5, 0 D). The measured value of the refractive diopters (1 D - is the power of a lens with a focal length of 1 m). The strength of refractive glass glasses when presbyopia is expressed by a positive number.
Correcting farsightedness age
As soon as there are signs of eye fatigue when viewing close objects, there is a need for vision correction. For the correction of presbyopia uses convex glass, enhancing the refractive power (refraction) of the eye. With age, the degree of farsightedness usually increases and corrective glasses periodically change. Today, instead of glasses seniors can wear contact lenses
Contact lenses - whether they can completely replace the glasses?
.
For the treatment of presbyopia now also use bifocal glasses sferoprizmaticheskie (BSPO) to relieve tension with the eye's lens and the regular wear significantly reduce the risk of progression of farsightedness. On the lower part of the glass in such glasses glued sferoprizmaticheskie elements (TEs). In BSPO look away through the upper part, and near - from the bottom. Such glasses several times reduces the eye strain.
In the best position are those with low and medium short-sightedness
Myopia - when visual acuity falls
- The age of wearing corrective glasses for reading they can significantly move away. If a farsighted man all his life took place in the glasses, presbyopia that will only worsen the vision and require stronger the diopter.
Treatment of age farsightedness may include drug treatment (vitamin-mineral complexes that support the tone of eye muscles), physiotherapy techniques (electrical stimulation, ultrasound), as well as exercise trains the muscles of the eye.
Treatment of presbyopia must be complex.
Galina Romanenko
