What is involved in the test of astigmatism?
There are several different types of astigmatism tests that can be performed to diagnose this condition. The most basic test of astigmatism requires the patient to explore a series of geometric, evenly distributed lines on the eye table. In most cases, the test is carried out using a tool called a keratometer that measures how the light is reflected from the cornea. The third test of astigmatism, called the topography of the cornea, creates a three -dimensional map of the corneal surface. In some cases, the eye lens may be the cause of the eye. Astigmatisms may vary a bit in intensity. Individuals who experience serious astigmatisms may have blurred, distorted vision and often complain about headaches and eye pain, while others with less astigmatism may not even require repair to overcome the condition. Most astigmatism tests look at the curvature of the cornea to diagnosis of the condition.
Basic test of astigmatism will require to withE patient looked at a picture or sign that consists of several thin lines that are located relatively close to each other and usually have a geometric shape. The image will be modified so that it is directly at the eye level and about 14 inches (35.6 centimeters) away from the face of the tested person to ensure optimal results. Once the patient is correctly placed, the optometrist covers one eye and orders the person to look at the graph. Those who have a difficult distinction between different lines on the graph can be diagnosed with astigmatism. The doctor will also repeat the test with the covered eye.
One of the most commonly used types of astigmatism test is keratometry that uses a keratometer to see the light reflects from the cornea. Although different types of karatometers are different, one of the most common uses a circle of light to see the corneal surface. The patient sits in front of the device and his chin rests on a solid form and removed glasses or contacts. The light is projected onto the eye and the measurement is performed.
The corneal topography is a more sophisticated test of astigmatism. In this test, the patient sits and face a pattern - usually a series of rings - which is illuminated. This pattern is focused on the cornea and reflects back into the machine. The digital image is captured by a machine and the computer creates a topological map of the cornea.
In the test of astigmatism, the patient should always bring any contacts or glasses that are currently used because the doctor may want to see how effective the eye coare is in the treatment of the condition. Those who experience serious symptoms without glasses or contacts, but not once they are usually, Require will not be any changes. On the other hand, those who have symptoms with glasses or contacts will usually need a new regulation to precisely treat the condition.
Most doctors will want to plan a number of ongoing meetings for those who are diagnosed with astigmatism. Appointment as common as every six months is not uncommon. The doctor will want to monitor any changes in the shape of the eye and UJIStit that any contacts or glasses still work efficiently.