Astigmatism is one of the common causes of low acuity. Often together with astigmatism in a patient diagnosed with myopia or hyperopia.
Occurs astigmatism at irregular shape of the cornea or lens, which in the normal state have a smooth spherical surface. When astigmatism their shape is disturbed image of the object. It gets slightly distorted, some lines become blurred.
Experts identify lenticular and corneal astigmatism. The vision has a greater influence corneal astigmatism, since the refractive ability of the cornea more than the lens.
Types of astigmatism
Astigmatism is divided into acquired and congenital. Most children have congenital astigmatism, which can be attributed to the "functional". Visual acuity and binocular are not affected. Significant reduction of vision and the need for spectacle correction may occur only when the astigmatism greater than 1 D.
Rough scar on the cornea, which appear due to injury, trauma, surgical interventions become a cause for the development of acquired astigmatism.
The degree of astigmatism
Distinguish the following degrees of astigmatism:
• low degree of astigmatism;
• medium astigmatism;
• high degree of astigmatism.
Correction of astigmatism
Today there are three ways by which you can correct astigmatism:
• contact lenses;
• excimer laser correction.
When astigmatism very often write "complex" glasses that have a special cylindrical lens. They are wearing patients with a high degree of astigmatism causes a variety of unpleasant symptoms: eye discomfort, pain in the eyes, dizziness, etc. For picking such important points thorough diagnosis. Often people suffering from astigmatism, forced to repeatedly change points.
Special astigmatics lenses also used for vision correction. If before this diagnosis was used only hard contact lenses, which badly affect the cornea and gave the patient the inconvenience, but today ophthalmologists basically prescribe you a special toric lenses.
Contact lenses and glasses help improve the quality of vision, time to adjust, but are not an effective means of getting rid of astigmatism. To completely get rid of the manifestations of astigmatism will only surgical intervention.