Today, a topic of “Irreversible fundus lesions caused by high myopia” rushed to the hot search, and netizens said: I feel that I am not far from being blind.
Image source: Weibo
Image source: Weibo
As a result, many people have questions.
How many degrees is high myopia?
What really happens to the eyeball with high myopia?
Irreversible what to do?
Today, we will briefly address these issues.
We generally consider myopia above 600 degrees to be high myopia, and this results in more than just being unable to see clearly.
As shown in the figure, the left side is the fundus of a normal person, and the right side is the fundus of a highly myopic person. You can see some “leopard print textures”. Why is there such a change?
(a) normal fundus (b) high myopia fundus
Image source: References
Generally speaking, the axial length of an adult’s eye is about 24mm. For every 300-degree increase in the degree, the axial length of the eye will increase by about 1mm. The higher the degree, the longer the eye axis.
For people with high myopia, the axial length of the eye is about 26mm or more, which is at least 2mm longer than that of people who are not nearsighted.
Don’t underestimate this short 2mm, the impact is actually great.
Our eyeball is surrounded by a series of important structures such as the sclera, choroid and retina. Think of the eye as a balloon. The bigger the balloon is, the thinner the wall becomes. The same goes for the sclera, choroid, and retina.
“Leopard pattern” is actually the pattern of blood vessels, which is exposed because the retina is too thin, and when the retina is too thin, various fundus diseases are easy to find.
For example: macular degeneration, retinal detachment, cataract, glaucoma, and severe blindness.
Image source: References
What about people with high myopia?
The answer is: a fundus examination every year.
The reason why fundus examination is necessary is to detect these lesions as early as possible so that doctors can take timely remedial measures.
For example, some people’s retinas may have local tears. At this time, surgery can be used to “weld” the retinal tears to make the retina more stable and avoid the tragedy of blindness. .
Furthermore, the fundus examination is much simpler than expected, its full name is “Mydriatic Fundus Exam”.
Before starting, the doctor will drop a medicine into the surface of your eyeball to dilate the pupil, which is called “mydriasis”, so as to facilitate a better view of the fundus. The whole process is compared with optometry Similarly, it can be over in ten minutes, and the price is not expensive, usually around a few dozen yuan.
Now more and more people are doing routine physical examinations every year, but for such an important part of the eyes, it seems to be ignored by everyone.
If you are also highly myopic, or if a family member or friend around you is highly myopic, remind yourself or them that:
Planning
Editor in charge: Yang Dafeng | Producer: Feidi
Cover Source: Dr. Lilac Design Team