What is the test for testing the vision for astigmatism?

1 What shows the testing of

In order to identify visual disturbances with astigmatism, it is enough to conduct special tests. After all, small manifestations of astigmatism basically do not lead to a visual impairment and cause no symptoms, however, during the test, even the initial stage can be detected. If you find a manifestation of the disease, you should immediately consult a doctor to determine if you need a correction.

The simplest test can be done independently, it is not necessary to visit a doctor for this. Take a piece of paper and draw on it a grating with exactly the same length and thickness of strips. Then this leaf begins to rotate before your eyes. If you have normal vision, then all lines on the grid you will see always the same. If you have astigmatism, then the length and thickness of the lines will vary, and you will also notice a change in color. This situation occurs because, in the presence of an incorrect focus, some parts of the image are blurred, while others, on the contrary, become sharper. You can easily determine by using this test whether your curvature of the lens corresponds to the norm.

2 Methodology for determining violations of

There are a lot of such tests. But basically for testing use the radiant images, such as, for example, the star of Siemens. This image looks like a star in which all the rays are directed to the central part, the image is on a white background. If you have astigmatism, then your rays will not reach the central part, but will blur and merge not only with each other, but with a white background. Then, a little closer to the center, the rays will again be visible clearly, but the image will resemble a negative( the image will change among themselves, the black lines will turn white, and the white lines will turn black).Everyone can see the various changes in the picture if he suffers from visual impairment.

If you are all right, then you will not notice any changes in this picture, but if you greatly approximate the image to the eyes, then you can get the same effect.

3 How to diagnose

It is very easy to perform these tests. No special knowledge is required for this. You need to sit up straight and substitute the image with the test in front of the eyes at a distance of 35 cm. First of all, close one eye and look well at the star of Siemens, then do the same with the other eye. Be sure to note all the changes that you noticed.

If you have normal vision, you will see the image clearly enough, all the lines will be the same in length and color and will not merge to the center. And with the appearance of astigmatism, you can see the phenomenon that was described above.

However, if you conducted a test and noticed some changes, do not rush to panic. It is necessary to go to the doctor to check your eyesight. In some cases, after examining your situation, the doctor can calculate these violations as the norm. But it can also reveal the development of astigmatism. If this happens and this disease starts to affect your vision, then you will have to make correction with the help of wearing lenses or glasses.

It is very important in this disease to check and visual acuity. After all, often with such a disease a person can confuse big and small letters and read distinctly small ones, and not even notice big ones. Such a moment must also be corrected, and if you have such violations, it is necessary to warn them about them.

Such light tests allow any person sitting at home at the computer to check their eyesight and then decide whether to consult an ophthalmologist or not. But do not forget that it is better to prevent the emerging problems and immediately contact the doctor at the slightest signs of visual impairment, in time to identify the disease and adjust it. If you delay this case, your vision will only worsen, and this can lead to irreversible consequences.