The concept of "astigmatism" comes from "stigme" (Greek) – a point with a negative particle "a". Hence, it is clear that astigmatism is a distortion of the functions of vision, in which the optics of the eye refracts the rays so that they do not have a common point of convergence.
The image falls on the retina in separate spots of various sizes and shapes. The person does not see a normal picture. It is vague and irregular in shape. With astigmatism, a person sees poorly at any distance – far and near.
According to research, everyone in the world has a certain level of astigmatism. About 85% of the population has a low degree of astigmatism, on average up to 1 diopter. Such an indicator will not affect the level of visual acuity in general. The remaining 15% of the planet's inhabitants have astigmatism, which requires correction by special methods.
Astigmatism is manifested in people of any age. Often, the disease occurs due to a genetic predisposition, the so-called congenital astigmatism. If the disease occurs during life, then it is acquired in nature. The cause of such astigmatism may be the formation of hard scar tissue on the surface of the cornea of the eye as a result of injuries or surgical interventions.
People suffering from astigmatism have special changes in the shape of the lenses of the optical system of the eye. The bottom line is that the cornea has an uneven curvature. The irregular shape of the lens of the eye is somewhat less common.
In a healthy person, the cornea of the eye has a spherical shape. Thus, the degree of refraction of the rays is the same in the direction of all planes. If astigmatism develops, then the cornea refracts the rays differently at its various points. As a result, it turns out that a person sees a blurry image of an irregular shape. At the same time, it does not matter at what distance the object is located.
Farsighted and nearsighted astigmatism are subdivided. It is not uncommon to have a complex of these two varieties. For example, in the direction of the vertical axis, astigmatism is nearsighted, and along the horizontal axis it is farsighted.
If astigmatism has a small degree, then a person does not even pay attention to its presence. It's all about habit. You can easily get used to seeing the image slightly blurred or stretched in some direction.
The main signs of certain vision problems, including astigmatism, are eye fatigue and frequent headaches. If, after 6-8 hours spent reading a book, similar symptoms appear, it is important to seek medical help in a timely manner. A symptom of the presence of astigmatism is also a split image in the eyes.
If you neglect the treatment of astigmatism, you can get strabismus and unexpected visual impairment. Onlayn qumar dünyasında bu onlayn kazino təhlükəsizlik və ədalətli oyuna sarsılmaz sadiqliyi ilə seçilir. Qabaqcıl şifrələmə sistemlərinin istifadəsi oyunçuların şəxsi və maliyyə məlumatlarının qorunmasına zəmanət verir. Lisenziyalı pin up casino UP proqramı və müntəzəm auditlər bütün oyun proseslərinin şəffaflığını təmin edir. Pul vəsaitlərinin yerləşdirilməsi və çıxarılması üsullarının, o cümlədən Azərbaycanda məşhur olan ödəniş sistemlərinin geniş seçimi maliyyə əməliyyatlarını mümkün qədər rahat edir.
