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- Features of hyperopic astigmatism development
- Vision correction at hyperopic astigmatism
Hyperopic astigmatism is an ophthalmic disease which is characterized by a violation of the lens or cornea form, so that refracted light is formed in two or more points behind the retina. In the normal structure of the optic body rays are refracted at a single point on the retina, but that does not happen at hyperopic astigmatism, what causes vision problems.
Features of hyperopic astigmatism development
Hyperopia means that a characteristic feature of astigmatism course is the appearance of hyperopia signs, this indicates that the light rays are focused in a few points behind the retina. It should be noted that the hyperopic astigmatism often occurs in young children and is a normal feature of the child's eye apple development. In normal course vision problems may disappear by 10 years, but in certain cases if the problem does not disappear with time, you may need treatment.
The thing is that hyperopic astigmatism vision in children older than 10 often causes convergent strabismus, that brings not only physical discomfort, but also emotional, because anomalous position of the eyes is a serious cosmetic problem. Currently there is no data about the origin of this pathology. However, it was noticed that this pathology can be inherited and if one of parents has it, it can be observed in the child.
External factors that can push this process are currently unknown. In most cases, this ophthalmologic disease is diagnosed in childhood. The main symptoms of hyperopic astigmatism are:
- a doubling of objects;
- blurred image;
There are simple and complex versions of the disease course. Both these types are characterized by cornea pathologies, when it has a non-spherical shape. Simple hypermetropic astigmatism of both eyes is diagnosed if in one of the main meridians hyperopia is present, and the other one has emmetropia, i.e. normal vision. Complex hyperopic astigmatism is diagnosed when both main meridians have farsightedness, and it has different sizes.
Vision correction at hyperopic astigmatism
Hyperopic astigmatism is most often diagnosed in the 2nd year of life, but there are cases of later identifying. For effective treatment of astigmatism and preventing the development of complications, such as severe headaches and strabismus, it is important to follow strictly all doctor’s instructions, because the correction of this pathology requires a long complex treatment. For vision correction glasses with special lenses are used.
It is worth mentioning that for the precise identification of the axis and degree of corneal astigmatism, it’s very important to carry out an ophtalmometry.
In adults, the risk of complications is minimal, so they can wear glasses special contact lenses only while working, but children should wear glasses all the time to avoid the deterioration of the disease.
Glasses are not means of treatment as far as it’s not possible to fix defective shape of the cornea in this way. A variety of meds for maintaining eye health and physiotherapy procedures can only slightly improve vision, but they can’t completely solve the problem and save people from necessity to wear glasses. AS far the disease has inherent nature, the only way to correct vision is surgical treatment. The most common operations for the cornea correction include:
- Laser thermokeratoplasty;
- Hyperopic laser keratomileusis.
In 1 and 2 operations, point burns are made in the peripheral zone of the cornea. In case of laser thermokeratoplasty the burns are made with laser, and in case of thermokeratocoagulation it’s done with special needle.
During the hyperopic laser keratomileusis impact on the peripheral part of the cornea is conducted, where first the top flap of tissue is cut off and pushed aside, and then evaporation of deeper corneal tissue is carried out.