What is the difference between myopia and astigmatism?

Everyone is very familiar with the degree of myopia. When people go to an eyewear store to get glasses, they have to test the degree of their eyes. In comparison, many people don't know much about the degree of astigmatism. But everyone knows that in addition to myopia, people's eyes also have problems such as astigmatism, so astigmatism glasses also appeared. The following is a detailed introduction to the difference between myopia and astigmatism.

What is the difference between myopia and astigmatism?

You don't need to get a higher astigmatism lens, leaving 50 degrees incomplete. Some people can adapt to astigmatism, while others cannot. Myopia degree can be increased by 25 degrees

Let me tell you about my experience. I used to have 200-degree myopia and 50-degree astigmatism. I didn't wear glasses with astigmatism originally because 50-degree astigmatism doesn't affect my vision much (corrected vision is 1.2). But one time when I changed glasses, I got glasses with 50-degree astigmatism. At that time, I could see things very clearly (it should be 1.5). But after wearing them for a while, my eyes got tired easily, and I had symptoms of nausea and headache. Later, when I put on the astigmatism glasses, I felt the same as before. I went for a check-up and found that the astigmatism had increased to 100 degrees. I regretted it so much that I decided not to get a prescription for astigmatism. However, my vision was worse without it (because it increased to 100 degrees). After persisting for a period of time, the astigmatism actually went back to 50 degrees, but I couldn't get rid of the remaining 50 degrees.

Therefore, I think that when getting glasses, you should not get a full degree of astigmatism, but 50 degrees less. For example, if the test shows that the astigmatism is 100 degrees, then get 50 degrees. This will help curb the development of astigmatism to a certain extent.

I think this may be the inertia of the human eye. Before, it was accustomed to 50 degrees of astigmatism. Suddenly, it was fitted with an astigmatism lens to remove this 50 degrees of astigmatism. The eyes were not used to it, and over time, they "created" another 50 degrees of astigmatism to meet their needs. Later, I removed all the astigmatism from the glasses, and the astigmatism returned to 100 degrees. My eyes were not used to it again, so they changed the astigmatism back to 50 degrees. But this 50 degrees is what it is used to, so it can't be eliminated.

In addition, it is matched like this: if the right eye has 200 degrees and 50 degrees of astigmatism, you can directly match it with 225 degrees of myopia. In this way, when looking far away, the astigmatism is divided into two parts in different directions, namely 25 degrees of myopia astigmatism and 25 degrees of hyperopia astigmatism. The astigmatism effect is reduced from 50 degrees to 25 degrees, making it clearer to see things.

In addition, astigmatism is not easy to calibrate accurately, because it is not just a matter of degree, but also of angle. It is usually inaccurate to do an eye test in an eyewear store. It is best to go to a regular hospital for a mydriasis eye test (quick, dilate in one hour, recover in 6 hours at the latest). Only after dilation can the degree and angle of astigmatism be accurately tested. If the astigmatism is not checked correctly, you will definitely feel dizzy.

It is recommended to reduce the astigmatism by 50 degrees and increase the myopia by 25 degrees. In this way, the remaining astigmatism effect is actually only 25 degrees, and you will not feel dizzy when looking back. For example, if after accurate eye testing, it is found that the myopia is 375 degrees and the astigmatism is 100 degrees, then you should get 400 degrees of myopia and 50 degrees of astigmatism. Of course, this is just an opinion. The key is whether you are used to wearing them. After having your eyes tested, try wearing the temporary glasses to get a feel for it.